Thanks for reaching back out, @joanne24.

I do apologize that we provided directions for Desktop and not Online.  Allow me to walk you through reviewing the transaction history in QuickBooks Online. 

Here's how:

1. Open the credit memo. 

2. At the bottom of the screen, click More. 

3. Choose Audit History. 

4. Now you'll be able to see the history of the credit memo. 

Please let me know if you find you need more help. I'll still be here on the lookout. Have a great rest of your day!