To add task assignees or followers, open the task by clicking on the task subject while the tasks are listed.
On the right side of the task modal, there will be a dropdown to select assignees.
You can add an unlimited number of assignees or followers to specific tasks and track their time logged.
After you add a member as assigned to a task this member will get a notification email and built-in that is assigned to this specific task.
When a task is related to a project only project members will be shown in the dropdown while selecting members as assignees.