In your Client Admin go to Assignments


To the far right of an assignment is the Copy button, next to the delete X


Click the copy button and you will automatically be taken to the newly copied assignment to edit


If you do not change the name of the copied assignment, it will appear at the bottom of the assignments as "Copy of..."


To copy a question in an assignment, open the assignment 


Click the Copy button on the far right of the question, next to edit and delete. 


The copied question will be added to the assignment and you can edit it as you'd like