I need help figuring out how to turn on creative mode while on a server. Is it just simply a button press while in the server or something else?
It's a console command.
/gamemode "yourname" 1
Having a 1 at the end sets it to creative mode, and having a 0 sets it to survival mode. Just replace "yourname" with your in-game name. It doesn't change the whole server's mode, but just the individual player's.