Be sure to read about how to get and use save codes.
You need to try and save in game, even though it can't really save to the cartridge, the data is created and used by the CodeSaver. Try it before you get too far with anything.
They expire in 90 days.
Impressive! I did not know this kind of stuff was possible these days. I do however prefer the illegal way of using ZNES and romz because i cn use joypad, play fullscreen etc.