How do I edit an existing assignment?
Go to Assignments.
Select the Assignments tool from the Tool Menu of your site.
Select the Edit link for the assignment you want to edit.
Make your changes to the assignment.
The assignment settings window will appear. Make any necessary changes. For more information on assignment settings, see How do I add an assignment?
Click Post to save your changes.
Note: If you modify an assignment after the Due Date, you will need to click Post twice in order for your changes to be saved.