You've got questions? AMA would love to hear from you. But if you haven't got questions and can't resist the urge to say something anyway, then this is the place..
1. Don't be an idiot
2. That's about it.. Put NSFW material behind LJ-cuts like a good responsible citizen, and otherwise, have fun..
Feel free to participate in the official community Picture Post, it's not mandatory, but it helps to see who you are.
There's an IRC channel for AMA - on the server irc.darkmyst.org, the channel is called #ama. If you're not sure how to get there, try mIRC, and read the instructions carefully. If all else fails, try checking out the IRC tag, as people often post information on how to join.