Actually, I did try to include the path when launching and I got an error. There is a thread for that here:
As for adding paths to linux and searching on google – I’m a novice for linux. I was able find some solutions – and I’ve tried a bunch since yesterday when I posted for help, but none are working so far.
If you could possibly help with a more detailed solution it would help me and anyone else who may be searching for “retroarch not found” (how I found this thread).