If I wanted to buy and set up MIRC (which I've done) what do I do to get to #divinelunacy?  Can anyone help me with this and explain the directions to me please?

Instructions I had written up elsewhere

Download mIRC
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

Thank you so much!

You're welcome. Did it work okay?

Some nifty other tricks: Tools > Options > (I forget which tab comes next, maybe server? Just look around you'll find it) then find "perform" an type /ns identify yourpassword, and click perform on connect. This will make it so you never have to type your password again to log in!