Unless you only want users with a + or an @ next to their nicknames to be able to speak I wouldn’t set the room +m. What I think you want is to gain @’s (moderator/room operator) status to control your room. If so then you must idenfity to nickserv using:
/nickserv identify YourPasswordHere
You should now have an @ next to your name and can control your room.
Nothing rhymes with Cindy Crawford after 9 coronas...