Posting on Usenet groups using Gnus

[Merciadri Luca]

Hello,

I looked in various manuals, but I did not find a way to post easily
in Usenet groups using Gnus. However, it is the primary role of Gnus.
When I use Groups > Subscribe > Subscribe to a group, typing the
Usenet group (i.e. here ``gnu.emacs.gnus'') does not work. How can I
manage to make it work, and, evidently, being conserved through Gnus'
shutdowns and restarts?

Thanks.