Solved Is there a way to change /pex to a diffrent cmd?

I`d like to change /pex to a diffrent command for example /pewax, why? Because recently my friend sent me a plugin that i installed, later on he gave himself perms with /pex user his name add *, if there was a way to replace the cmd with a diffrent one, it would be easy to make backdoors usless. *just a question tho

 

edit, solved already.