Are you just wanting to add codes to an existing gamegenie xml file? That is to say, on your current NesterDC disc, you already have Earthbound Zero and gamegenie codes for it?
If that is the case, look in the roms folder to see what the name of Earthbound Zero is (ex. 006), this will most likely be trial and error.
Once you know the name/number of the rom, look in the gamegenie directory, find the xml file with the same name/number and edit. Reburn the disc and you're good to go.
If you need more detailed info, let me know.
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