Do not target others or make mean, hateful, racist, sexist, or homophobic comments. Your joke might be hilarious and you might be super nice, but both are hard to tell in a chatroom. You'll be banned.
Don't spam the same message over and over. Spamming annoys people and will probably result in a timeout.
Have a good time! My chat is loosely moderated, so the mood is on you. If you notice things going in the wrong direction, don't call someone out. Just steer everyone in a happy direction!