help

This is less about the Mario 64 and more about the B3313 rom hack. I wanted to try out all the different 64 character mods out there with this game. Is there a way to edit the z64 file to add characters, mainly ones from gamebanana? Or is it a bad ideal and might break the game? I know nothing...

I don't know if I found a bug or what but in the review rating section I find it impossible to edit this 8 to a 10, I edit it myself like 3 times but it seems to no change lmao any of you have an idea?