You need to ask an op to invite you... try /names #channelnamehere (I guess /lusers works as well), and check for people with an @ next to their names. Use /msg usernamehere messagehere to send them a private message (as stated before, I think /query does the same as /msg) Ask them, be polite, and go straight to the point. Most ops won't answer if you start by asking about the weather... just be clear and concise.
