Snes9x.com

I need help for my Snes9x 3ds version. So i dont know how to have cheat code with .chx or .cht i search for like 1 hours and i found nothing i have a url that show all cheat but i dont know how to put this on chx/ cht files https://github.com/recalbox/recalbox-buildroot/blob/master/board/recalbox/fs...