Ok so I've just downloaded mIRC but I don't know how to set it up.

Can anyone help me?

2) Download mIRC from here; www.mirc.com
Next choose the server option from the left hand side. Click the add button.
Description - Anything (I put mafia)
Server - irc.mafiareturns.com
Port 6667
Click add and you are back to the options screen. You can now hit connect to server.
Once connected type /join #divinelunacy.

Wow thanks!  And such a fast response too. :)

Takes some getting used to for me, since im so accustomed to The 'Zilla, but i'll give it a try :)