Refund a credit memo.

It's good to see you here in the Community, Fanny Chen.

You can create a check affecting the Accounts Receivable (AR), then go to receive payment window and link the credit memo and check from there. This way, you can refund the transaction to the customer.

Here's how:
 

1. Click the + New in the left panel and choose Check.
   Select the customer's name.
2. From the Category column, choose Accounts Receivable.
3. Enter the Amount and other necessary details.
4. Hit Save and close.
   

Once saved, you can link the check and credit memo through the receive payment window.
 

Additionally, you can visit the following write-up: Sales and customers. This will provide you with links on how to manage your company income as well as customer-related concerns.

If I can be of assistance while working in QuickBooks, please let me know. I'll be more than willing to lend you a hand.