Can someone explain me why doesnt work, i dont know if i need a code genie

Im new in speedruns and im using sne9x, but i dont understand this: "More specifically, no letting the instruction pointer hit anywhere but ROM, open bus, and the intended RAM area ($7F8000-$7F8182), and no modifying the intended RAM area"

i dont know how to do it, someone can explain me (i use snes9x v1.54)

Hi, recently start to play ninja gaiden and i see differences between playing in emulator and NES, so i want to know if there's any good emulator (i use Mesen) or the ingame in NES always will be diferent

PD: Ex. The climb sometimes doesnt work