Hello, meganrosecransps. 

Thanks for getting back to us. I'm here to clarify the steps provided by MarshallA.

What MarshallA meant is that the + New button is located on the left panel. To elaborate the steps: 

1. Click the + New button, then select Credit card credit. 
2. Under Payee, select the vendor's profile. 
3. For the Bank/Credit account drop-down menu, choose your credit card account. 
4. Enter the same expense account or item you bought from the vendor. 
5. Add the amount refunded.
6. Enter any other important details such as memo, reference number, etc..
7. Once done, click Save and close. 

Doing this will decrease your credit and the expense accounts' balances. 

If you need help managing your credit card account, visit this article for more details: Record your payments to credit cards.

Need to reconcile your credit card account? You can check this article for the workflow: Reconcile an account in QuickBooks Online.

I'll help you manage your transactions or records in QuickBooks Online again. Just lay down the details in your reply and I'll get back to you with the guides and such.