Each task must be assigned to someone. The person who receives the task can decline, accept or assign it to someone else. If they decline the task, it is returned to you. If they accept the task, they become the task assignee. If they assign the task to someone else, the new person becomes the task assignee, and gets the choice to accept/decline/reassign the task and so on.
To assign a task, select a task, click Reassign and select a new task assignee. You can also assign a task to yourself by clicking Assign to Me.
Assigning a task to another user