ANSWER:
This one is pretty easy, but if you don’t know where to look you might miss it.
Scroll the WHOLE way down to the bottom of the forum page, and there you’ll find it. You can subscribe or unsubscribe at any time.
If you are a committee member, I suggest you subscribe to the WHOLE forum like this:
This makes the forum more like a list-serve. It will email you any time a new topic is posted under a specific forum group.
Or if you are just interested in a topic subscribe to the topic: