For those running Windows, go to www.mirc.com and download the client if you don't have it.
After you set up your user info stuff, type: /server -m irc.phoonet.org -j #adventchildren_. Then type: /nick (your LJ name). To register, type: /msg nickserv register (password) (email)
For those running a Mac OS, go to http://www.stuffonfire.com/software/ and grab JediKnight 2.1, which is what shinra_inc uses.
Type in your LJ name for your Nick, some random crack for your userinfo, then click create. In description, type: Phoonet, Host and Port: irc.phoonet.org 6667, and leave Password blank. Then connect. Type /j #adventchildren_. To register, type: /msg nickserv register (password) (email)
There you go. I hope to see you all there ^^