How to subsribe to a general mailing list?

[Durand]

Hello:

I know how to subsribe to a mailing list on a known server, like this
list gmane.emacs.gnus.user.  Now I am wondering how do I know the
server to connect to?

In particular, I am trying to subscribe to the following mailing list
<https://lists.sr.ht/~protesilaos/modus-themes>.  But I don't know how
to do so in Gnus.

Did I miss something or do you have any suggestions?

-- 
Durand