Now, we placed the SUBSCRIBE button in the top right of the first post. That has always been on this but sort of hidden. We moved it as per Janet’s request. There is also the “NOTIFY ME…” checkbox at the bottom that has always been there.
To be clear, the way forums work is that they are passive. If you post a topic it will NOT go out to anyone unless they peruse and reply. Then those two persons will be notified of new replies. If someone notices a forum topic and doesn’t reply but hits subscribe then they’ll get notices. This is standard Forum use.
If you want to message people directly then you email/message them from the messaging part of the site. I’m doing a little more testing on Groups and also personal notification settings in general. I’ll follow up shortly.