Find the Transaction you need to Refund
Use the "Lookup Individual" Action to search the Patron Account. Then select "Account Details" to view the Patron's financial history.
From the "Charge View" show "All" in the filters and highlight the transaction you want to refund.
Select "Refund Item" You'll be prompted to give a reason for the refund and then be redirected to the cash register to complete the transaction for the refund.