Happy Friday, @joanne24.

I hope you're having a great day so far.

Since our Ctrl + H shortcut keys aren't working for you, let's get to the history the old fashioned way with just a few simple clicks. 

To do this:

1. Open the Credit memo. 

2. At the top of the screen, click the Reports tab.

3. Choose Transaction History.

That's all there is to it. Please let me know if you have any more questions. I'll be here on the lookout to help you. Take care!