Thanks for your reply!
1. How do I edit this configuration file? What commands do I use? What parts of the file do I edit?
2. I set the memory to 256/256 split. Is because I had a keyboard plugged in at the same time?
3. Yes it starts emulationstation on boot. I tried pi, and raspberry but they didn’t work.
To answer your questions.
Raspberry pi model B
I have only tried the MegaDrive emulator and the SNES emulator. The standard ones packaged with RetroPie SD Card image 1.10.1