Follow these steps to copy a certificate design:
1) Click the 'certificate designs' tab in the top menu
2) Click the 'Create Certificate Design' button
3) Select from 'my designs' or 'default designs' in the top menu.
4) Select the design you want to copy and edit
5) Make your desired changes.
6) Give it a new name and hit save and close at the top righthand corner. (make sure to do this!)
You're all done!