Tags are an option for your public catalog :https://catalog.bywatersoluti ons.com/ for example. The link you sent was the staff client which is
where you would set up the System Preference for Tagging to be allowed
(tagsenabled) which can be found in the Administration Module under Global
Nabble is a web version of the mailing list not supported by the
community. Usually once you have subscribed to the mailing list, you use
your email client to read and write to the lists. You'd just send and
email to [hidden email] and receive all answers to the list
into your inbox.