Thanks for your response.
You're welcome
And I just read your second link and that looks like exactly what I need to know. I hope that all the buttons correlate with the games like they should but that helps a ton! I will give those a shot tonight.
Also there are some Video Tutorials further down on that same document that might be of some help as well.
You can see which emulator you are using from the Runcommand screen (which is what pops up for a couple seconds when you first launch a game). If you have more than one emulator for a system install, you can change the emulator from the Runcommand. Here are the documents about Runcommand:
https://retropie.org.uk/docs/Runcommand/