news.aol.com may work for the news server name or checkout http://www.aol.com/netfind/scoop/
Or contact AOL tech support. If for all the money you're paying them they can't get you up and running you might consider a different ISP.
Just been advised by AOL that Newsgroups access now requires external access. Downloaded Agent Newsreader but it requires, as a minimum, the inclusion of a News (NNTP) Server reference? Can you recommend a server reference so I can activate the newsreader? Thank you!