It is not a mailing list, so you don't join it the way you join a mailing list. There are three ways to read it. Some ISP's and universities have special software for reading news. You'll need to contact your help desk and ask them how to read news.
Most web browsers can read news.
So again, you'll have to contact your help desk, and ask for the name of their news server. This is a public news service, which anyone can use.