1. Search for the order you need to modify.
2. Click the "Payment" button on the bottom dashboard to pull up payment details.
3. In the upper left hand side of the screen, click "past transactions".
4. In the row as the charge you'd like to refund, click the red "refund" button.
5. Enter a reason for the refund.
At the top of the screen, you'll see a blue "Refund Successfully Processed" banner.