Dave, I just added a new forum to my subscribed list and now only see that new forum listed as subscribed. It appears the other forum(s) are no longer subscribed. Did I lose the others or am I mis-interpreting how this is supposed to work.
Thanks

When you're not "watching" any forums, then the entire list of all the forums is shown to you on the front page.

So as soon as you subscribe to one, then you're just seeing the one.

So, click on the Forums tab up top and you will then see the entire list and you should then subscribe to all the ones you are interested in!

Dave, I thought I was also subscribe to Sempervivum and Sedum. I already understand how to get the forum list. Thanks

It may have been that you were watching a single thread in that forum rather than that forum itself.