I'd suggest using a Free alternative. AOL's software is crap (especially the half-baked Linux port). Two really great IM clients, each supporting a number of different protocols (AIM, MSN, Yahoo, etc.), are Gaim and Kopete. You can download Gaim here -->
http://gaim.sourceforge.net and Kopete here -->
http://kopete.org/
Both sites have straightforward installation instructions. They also should both be included with Mandrake (although not neccessarily the absolute latest versions). You can use drakconf to install them (click "Software Management" and then "Install" within the "Mandrake Control Center").