Duplicate a Design in the Editor:
If you happen to be working on a design and you want to edit it follow these steps:
From the editor click on Resize which can be found in the top right corner.
Click on the Make a Copy button.
A new copy of your design will be created and opened. You'll notice the title of your duplicated design will include _new at the end. For example a copy of a design titled "Modern Proposal" would be titled "Modern Proposal_new".
Duplicate From The My Designs Page:
You can also duplicate the design from the My Designs page. Just follow these steps:
Click on My Designs.
Hover your mouse over the design that you want to duplicate.
Select the gear icon on the top right corner of the design.
Click on Make a Copy.
A copy of your design will be made. The new copied version will have Copy- at the beginning. For example a copy of a design titled "Modern Proposal" would be titled "Copy - Modern Proposal".