Here are the instructions for the frontend changes to implement the multi-profile selection for tasks.

**1. HTML Structure**

The following HTML block should be added inside the task editing popup. The popup seems to be generated by a javascript function called `estruturaTarefa`. You should find that function in your javascript files and add this HTML block in a suitable place inside it, likely near the "Responsáveis" or "Prioridade" sections.

```html
<div class="campo-tarefa-perfis">
    <div class="label">Perfis</div>
    <div class="selecao-perfis">
        <div class="selecionados">
            <!-- Selected profiles will be added here -->
        </div>
        <div class="dropdown-perfis" style="display: none;">
            <div class="search-box">
                <input type="text" placeholder="Pesquisar perfis...">
            </div>
            <ul class="lista-perfis">
                <!-- List of available profiles will be populated here -->
            </ul>
        </div>
        <div class="btn-adicionar-perfil">
            <svg viewBox="0 0 24 24"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm5 11h-4v4h-2v-4H7v-2h4V7h2v4h4v2z"/></svg>
            Adicionar Perfil
        </div>
    </div>
</div>
```

**2. CSS Styling**

You might need to add some CSS to style the new elements. Here is some example CSS you can add to your stylesheet (e.g., `/browse/comum/css/painel3.css`):

```css
.campo-tarefa-perfis {
    margin-bottom: 15px;
}

.campo-tarefa-perfis .label {
    font-weight: bold;
    margin-bottom: 5px;
}

.selecao-perfis .selecionados {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 5px;
}

.selecao-perfis .perfil-item {
    background-color: #f0f0f0;
    border-radius: 3px;
    padding: 3px 8px;
    font-size: 12px;
    display: flex;
    align-items: center;
}

.selecao-perfis .remover-perfil {
    margin-left: 5px;
    cursor: pointer;
    font-weight: bold;
}

.dropdown-perfis {
    position: absolute;
    background-color: white;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    z-index: 100;
    width: 200px;
}

.search-box input {
    width: 100%;
    padding: 8px;
    border: none;
    border-bottom: 1px solid #ccc;
}

.lista-perfis {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 150px;
    overflow-y: auto;
}

.lista-perfis li {
    padding: 8px;
    cursor: pointer;
}

.lista-perfis li:hover {
    background-color: #f0f0f0;
}

.lista-perfis li.selecionado {
    background-color: #e0e0e0;
    font-weight: bold;
}

.btn-adicionar-perfil {
    cursor: pointer;
    display: flex;
    align-items: center;
    color: #3e63dd;
}

.btn-adicionar-perfil svg {
    width: 18px;
    height: 18px;
    fill: #3e63dd;
    margin-right: 5px;
}
```

**3. JavaScript (jQuery)**

The following JavaScript code should be added to a script file that is loaded on the page, for example at the end of `browse/footer.php` inside a `<script>` tag, or in a separate `.js` file that is included.

```javascript
$(document).ready(function() {

    // Open/close the profile selection dropdown
    $(document).on('click', '.btn-adicionar-perfil', function() {
        $(this).closest('.selecao-perfis').find('.dropdown-perfis').toggle();
    });

    // Close dropdown when clicking outside
    $(document).on('click', function(e) {
        if (!$(e.target).closest('.campo-tarefa-perfis').length) {
            $('.dropdown-perfis').hide();
        }
    });

    // Search for profiles
    $(document).on('keyup', '.search-box input', function() {
        var searchTerm = $(this).val().toLowerCase();
        $('.lista-perfis li').each(function() {
            var profileName = $(this).text().toLowerCase();
            if (profileName.includes(searchTerm)) {
                $(this).show();
            } else {
                $(this).hide();
            }
        });
    });

    // Select/deselect a profile
    $(document).on('click', '.lista-perfis li', function() {
        var perfilID = $(this).data('id');
        var perfilNome = $(this).text();
        var isSelected = $(this).hasClass('selecionado');

        if (isSelected) {
            // Remove from selected list
            $('.selecionados .perfil-item[data-id="' + perfilID + '"]').remove();
            $(this).removeClass('selecionado');
        } else {
            // Add to selected list
            var perfilItem = '<div class="perfil-item" data-id="' + perfilID + '">' + perfilNome + '<span class="remover-perfil">x</span></div>';
            $('.selecionados').append(perfilItem);
            $(this).addClass('selecionado');
        }

        saveTarefaPerfis();
    });

    // Remove a profile from the selected list
    $(document).on('click', '.remover-perfil', function() {
        var perfilID = $(this).closest('.perfil-item').data('id');
        $('.lista-perfis li[data-id="' + perfilID + '"]').removeClass('selecionado');
        $(this).closest('.perfil-item').remove();
        saveTarefaPerfis();
    });

    // Function to populate the profile list (to be called when the popup opens)
    function popularListaPerfis(lstPerfis, perfisTarefa) {
        var perfisTarefaIDs = perfisTarefa ? perfisTarefa.split(',') : [];
        var listaPerfisHtml = '';
        var selecionadosHtml = '';

        if(lstPerfis){
            lstPerfis.forEach(function(perfil) {
                var isSelected = perfisTarefaIDs.includes(perfil.ID.toString());
                var selectedClass = isSelected ? 'selecionado' : '';
                listaPerfisHtml += '<li data-id="' + perfil.ID + '" class="' + selectedClass + '">' + perfil.Nome + '</li>';
                if (isSelected) {
                    selecionadosHtml += '<div class="perfil-item" data-id="' + perfil.ID + '">' + perfil.Nome + '<span class="remover-perfil">x</span></div>';
                }
            });
        }

        $('.lista-perfis').html(listaPerfisHtml);
        $('.selecionados').html(selecionadosHtml);
    }

    // Function to save the selected profiles
    function saveTarefaPerfis() {
        var tarefaID = window.tarefa.ID; // Assuming window.tarefa is available
        var espacoID = window.tarefa.EspacoID; // Assuming window.tarefa is available
        var perfisIDs = [];
        $('.selecionados .perfil-item').each(function() {
            perfisIDs.push($(this).data('id'));
        });

        $.post("/browse/AJAX/save-page.php", {
            acao: 'saveTarefaPerfis',
            tarefaID: tarefaID,
            espacoID: espacoID,
            perfisIDs: perfisIDs.join(',')
        }, function(retorno) {
            if (retorno.sucesso) {
                // Optionally show a success message
                console.log('Perfis da tarefa salvos com sucesso!');
            } else {
                alert('Erro ao salvar os perfis da tarefa.');
            }
        }, 'json');
    }

    // In your existing `openPopupTarefa` function, you need to call `popularListaPerfis`.
    // It seems you have a function called `openPopupTarefa`.
    // Inside the success callback of the `$.post` call to `getItemTarefa`, add the following line:
    
    /*
    function openPopupTarefa(tarefaID){
		...
		$.post("/browse/AJAX/edicao-page.php", {
			acao: 'getItemTarefa', 
			tarefaID: tarefaID
		}, function(retorno) {
			...
			window.tarefa = retorno.tarefa;
            ...
            
            // Add this line
            popularListaPerfis(retorno.lstPerfis, retorno.tarefa.Perfis);

			var html = '';
			html = estruturaTarefa(item); 
            ...
		}, 'json');
        ...
    }
    */
});
```

The provided javascript assumes that you have a global `window.tarefa` object that holds the current task's data, including `ID` and `EspacoID`. I can see in `browse/footer.php` that you are already doing this.

You will also need to find your existing `openPopupTarefa` function and add the call to `popularListaPerfis` as shown in the comments of the javascript code above. This will populate the profiles list when the popup is opened.

These changes should implement the desired functionality.