How to mark a Complete Task as Pending again?

To assign a completed task as a pending task, go to the dashboard and click on the ‘My Tasks‘. Here you can view the complete report of Unassigned Task, Pending Tasks, and Completed Task.

Go to the completed tasks section, select a  particular task and click on the ‘Undo‘ link.

Now you can see that your completed task has assigned as a pending task.