To archive a class, go to your "Manage Classes" page. Click on the "Options" dropdown for the class you wish to archive and select "Archive Class."
Your class and all of its assignments will then be removed from "Active Classes" and saved in the "My Archived Classes" page.
If you would like to view any of your archived classes later on, you can do so by clicking on the "Archived Classes" button on the "Manage Classes" page.
You can also restore or undo an archived class by clicking on the "Undo Archive" button on the "My Archived Classes" page.