Hey guys, I just got an everdrive 64 plus and I have no clue how to set savestates. I know that there is a practice rom for mario 64 but I do not have an expansion pack to use it. if anyone could help me figure this out it would be great.

Sorry friend, but save states aren't a thing for the EverDrive 64. I don't know much about the technical details, but this appears to be a hardware limitation to how the Nintendo 64 works compared to other systems that Save States do work for.