My husband accidentally changed a customers name on a payment posted 2 years ago. how do we change it back to the correct customer?

Great to see you posting in the Community forum, becllc1.

I'm here to help you with changing the customer name for an invoice in QuickBooks Online (QBO).

You can easily modify the invoice with the incorrect customer name by opening it and making the necessary changes. To do this, here's how:

1. In the left menu, click Sales.
2. Go to the Customers tab.
3. Locate and click the customer's name to open the Transaction List.
4. Locate the payment and select it to open.
5. Rename the customer.
6. Click Yes to confirm.

That's it! You have successfully corrected the payment with the correct customer name.

If you mistakenly apply a payment to the wrong invoice, you can refer to this article to learn how to fix it: Fix a payment applied to the wrong invoice in QuickBooks Online.

Feel free to comment below if you have any other questions about customer payments in QuickBooks Online. I'm always here to assist you. Have a wonderful day!