Mailing Lists
GNU Coreutils
To subscribe and unsubscribe, go to the /mailman/options/<list-name>.
There will be a few forms to login, subscribe and unsubscribe.
I only got the path above by a web search.
Couldn’t find the links to /mailman/options/<list-name> in the home page or its linked pages.
On lists.gnu.org there is a the listinfo page URL. There, search for the list of interest and click its link. There you’ll also have a form to subscribe to the mailing list.