Hello and good day, harry12.
I'd be glad to walk you through the steps. To delete a credit memo, here's how:
- Go to Sales > Customers.
- Select the customer's name and click to open the Credit Memo.
- At the bottom, select More and choose Delete.
- Click Yes to confirm.
I've got a sample screenshot for a visual guide here:
I'm also sharing this article that you can bookmark for future reference: Void or delete transactions in QuickBooks Online.
Please know that the Community is available 24/7 if you need more help. Take care!