How do we use them? For example in majoras mask theres a cheat that says play as => ? Or something like that how do we play as some one else. And in ocarina of time theres a cheat to play beta worlds, how do we do that?
In the PJ64 folder go to the Docs Folder & Cheat Codes.
Then click on the pj64 cheats URL & then Click the Enable Link on the menu.
In fact click on everything there to learn how to use it.