How to add new emulators (Gameboy, SNES, etc.)

@Metalcory Im having trouble getting the icons to work. Im very new to this sort of thing, but was able to install multiple emulators and and roms with some considerable effort. Now my goal is to install icons for each of the emulators. I guess my question is where to put the png files of the icons when I connect to my Gameshell so that i can follow the steps in the terminal and assign them a location. Thanks in advance.

Franky