Help with patching NES codes

[Jackbtripper]

I’m trying to add some codes or hacks to a rom. (NES Karate Kid.). I downloaded a xml file. How do I add it to my rom so I can play?

[Tony H]

I moved your post here to the Retro section.

[Tony H]

There are programs that will patch codes into your ROM. One of them is called Game Genie Guy: https://www.romhacking.net/utilities/1054/