How can I set up IM settings on a e61 to work with AIM?
IM settings
You can't without using an IM app that supports AIM (Agile Messenger or IM+, for example).
The S60 built-in IM app works only with "Wireless Village" compatible IM services, such as, e.g, http://www.yamigo.com/ (which is the only one I know of).