AIM doesn't let you delete any of your accounts, but you can make a new one.
Right click the group and scroll down to delete. Right click the group and scroll down to delete.
Apparently, you just can't erase your AIM account! =( Ya sad but you might get some help if you go on http://www.google.com/ and type in the search engine "How do you erase your aim account" and then...
highligh the group go to edit and click 'delete section'. it will ask you 'are you sure you want to delete the section ______' click okay.
You should have the ability to delete all programs off of your computer if you want.