To go to a different newsgroup use nn's Go command (G).  For example,
here's how to go to one of the newuser newsgroups (which is a good
idea):

 Prompt                          Type         In order to...
 ======                          ====         ==============
 <menu mode>                     G            Go to...
 Group of Folder (+./~%=sneNbB)  newuser RET  ...next newsgroup with
                                             `newuser' in its name
 foo.newuser                     n RET        no, go to next
 news.announce.newusers          y RET        yes, go to this newsgroup
 Number of articles (juasne) (j) RET          jump to the newsgroup


For now, don't worry about what the cryptic-looking prompts mean.  At
the final prompt you should press RET which means do the default --
`j' for jump (or `a' for all if jumping is not possible).

Once you get to the newsgroup look in the upper right corner of the
screen to see if you are subscribed to the newsgroup.  If you are not
subscribed, it will say:

 UNSUB

In order for nn to keep track of the articles you read, you need to
subscribe.  To subscribe to news.announce.newusers, do this:

 Prompt                                                         Type
 ======                                                         ====
 <menu or show mode>                                            U
 Already unsubscribed. Resubscribe to news.announce.newusers?   y

U is a toggle that unsubscribes you from a subscribed group or subscribes
you to an unsubscribed group.

TIPS
* When searching for a newsgroup with the G command it's a good strategy to
  use a short search string so that you will hit all variations, e.g., use
  sport rather than sports so you will be presented with the alt.sports
  hierarchy as well as rec.sport hierarchy.
* You can always break out of a prompt with ^G.

Some parts © 2009 Advameg, Inc.