Navigate to Admin -- User Administration, and the ISN owner will see the following button:
Clicking on the View Deleted Users button will bring you to the following page, displaying all deleted users. Simply click on the red undelete user button of the user to be restored, and that user will be brought back as an active user in your ISN!
If you have any questions about this process please let us know! You can reach us by chat, email at email@example.com, or phone at (800) 700-8112.