Hi Donna,
If you are looking to adjust a paid order and submit a refund to a registrant, you can follow these steps: Invitees & Registrants > Select invitee > Orders & Payments tab > Click on the dropdown arrow next to the item > Adjust Order Amount > Update amount to lesser value or $0.00 as needed > Create Refund Order > Save > Actions dropdown > Submit Refund > Review and Submit.
Best,
Danni