really??? its easy.. hell even i figured it out!!! anyhoo..
you have to download it.. here's the link for that..Instant Messenger - AIM - Instant Message Your Online Buddies for Free - AIM
once that is on your computer which is sounds like it is, there is a little button on the right top of the screen that says "add" click on that and you can add your buddies.. haha ummm i'll add you right now and see what happens.. my email is >firstname.lastname@example.org so if that shows up its me..
EDIT- i just added your screen name and its saying your not online..