Trillian
1. After you install Trillian and run it for the first time you should see this:

Just enter a nickname and choose a picture.
2. Next, unless you want to use Trillian for these things as well, you can disable all of these plugins:

3. Now that we're up and running click on Trillian>Trillian preferences...

4. Now click on Plugins...

5. Check the box for IRC then click on Identities & Connections...

6. Click on Add new connection>IRC...

7. Now fill out the information just like I have here. For the nickname, username and user info, just put the same thing. It'd probably be best if you check the box that says "Automatically connect to this account at startup" too. Once you fill it out, click on "Connect," then click on "Close" in the bottom right hand corner.

8. Now that you're connected to the server you need to join our channel! Click on the little clear ball looking button, then click on "Join a channel"

9. Type in our channel's name and click OK...

10. A window should pop up like this, and you are ready to chat with us! Say hi!
wink 
********** NOTE **********
Now that Trillian is all set up, next time you want to come on IRC you only have to start Trillian, then follow steps 8-10.