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All users (except collaborators) on all account types can assign tasks. You can assign tasks to teammates when creating a task and any time later on
You can assign tasks to any member of your team from Task view:
Navigate to a folder, project, or space where the task is located and select it from the list. If you're creating a task, the task will open as an overlay in Task view.
Click the +Add assignee button at the task panel.
Select a person to assign a task to from the list. If you don’t see the right person start typing their name in the search bar and select them from the search results.
Click + to add additional assignees.
Alternatively, you can right-click a task in the list and select Assign.
All task assignees will receive a notification to their Inbox. Also, the task is shared with assignees automatically.
External users can only assign tasks to people with whom these tasks are shared already or to themselves.
It's possible to add or change assignees from Table view. You can do it one by one or assign a bulk of tasks to the same users using mass actions.
Navigate to a folder, project, or space where the task is located.
Switch to Table view.
Make sure that you see the Assignee column.
Double-click the cell in the Assignee column next to the task’s title and select assignees for the task.
When you're done click anywhere outside the field.
To mass assign tasks:
Select a cell with the person you want to assign tasks to.
Drag the blue square in the right corner of the cell down the column.
Click here for more information about how mass editing works in Table view.
To unassign a task from the individual users:
Open the task in the Task view.
Hover over the assignee avatar on the task panel.
You can also right-click a task in List view (on the left-hand navigation panel) and click Unassign from everyone.
If you need to change the task assignee you can always reassign it. Right-click a task in List view on the left-hand navigation panel and select Reassign. This way the assignee list will be changed completely to the selected user(s).
Yes, it’s possible to assign tasks from the table portion of Gantt Chart. It works the same in Table view but without the mass edit option.