sudo is short for super user do (the config files can’t be opened by a “regular” user)
nano is a small text editor that runs in the terminal.
If you’d rather, I uploaded a pre-edited file to this thread.
My post is toward the bottom with instructions on how to get the file from your PC to your printer. Process is not “super easy” but is simper than editing a configuration file in the terminal.
PROTIP: if you have a windows11 PC Google WSL2 for dummies. Once enabled WSL2 lets you “play” with ubuntu to learn skills that will help you make future changes to your printer.