Assistants can return completed or work in progress dictations back to pending by going to the Report tab, selecting the right office/department on the left hand side, clicking on Completed for completed dictations and Queue for WIP dictations, and clicking the Message ID of the dictation they want to return with the left mouse button. This opens a new page. The option to return dictation back to pending can be found on the "Actions" page. Please see the screenshot below:
 
 
 
After you have clicked on the message ID of the dictation, click Actions. There you should find the option to Return to Pending and Return dictation to transcriber. Pending returns the dictation back to the public queue, and Return dictation to transcriber returns the dictation to the specific transcriber's Open Dictations tab.