ok, here's the trick:
when you launch it, there's that info box.
asks for NickName, user info, etc... you HAVE to fill in all the fields. so put SOMETHING in the about. then on the server dropdown, choose "create".
input irc.irvingnet.net as the servername.
no password. put irvingnet or something in the description. the port is fine. hit create, then put #tfp in the target and hit create.
a SHITLOAD of stuff'll scroll by in the console and then the window should pop up w/ the channel.
if you're stuck, feel free to message me.
...also, i might suggest a trip to Tilted Newbies and a read-through of the irc faq thread there. I have some instructions on using X-Chat aqua, which is a bit more friendly program.