To un-assign something from a class:
1. Click on 'My Assignments' in the navigation bar at the top of your account.
2. With 'Active Assignments' selected, scroll through your assignments or use the 'Search by title...' to find the one you’d like to unassign.
3. Once you have located the assignment you wish to unassign click the bottom icon as shown below.
4. The assignment will automatically be moved into the 'Unassigned Classes' section and removed from the students' assignment list.