Do you have OE installed on your computer? If so, set up a new account on
it, of the news type (not mail), fill out what is relevant to your personal
info (name you wish to post with, email address (although it's best to use
some form of "munge"ing like (e-mail address removed) ) - and for the
server name, use msnews.microsoft.com. Then once you're in, you pick the
newsgroups you wish to subscribe to using the Newsgroups button.
OE help will provide more information on this - it's worth doing.