To begin using AOL's Instant Messenger, first download the software
which is available from http://www.aol.com/aim/aim40.html.
After downloading the program, you will be asked to restart your computer
before using the program. Bookmark this page so that you can return
to it and continue the setup procedure.
This tutorial is
for version 4.1.1068 of AOL Instant Messenger for the Macintosh. If
you are not sure which version you have, click on the apple at the top
left hand side of the screen and choose "About AOL instant Messenger
(SM)."
After downloading
the software, you will need to register and choose a screen name and
a password before you can send and receive instant messages.