Thanks for your votes of confidence, but I don't have all the answers yet!
To subscribe to a forum, start on the "HOME" page. Next to the forum name, about in the middle of the page, is a green circle with a check mark. Hover over that, and you will get the option to subscribe to the forum. Click that. Then you should get a screen with "Notification Options". I'm not sure what those mean exactly, but I selected the daily E-Mail. It hasn't been 24 hours since I did this, so I haven't gotten an E-Mail. Then click on the "Subscribe" box. That should do it.
Now click on Settings, which is at the top of the screen, to the right of your name. On my screen, I first see subscribed threads with new posts. Under these are just the forums I have subscribed to.
Unfortunately this doesn't seem to effect "What's New". I haven't figured out how to just see new topics in just the forums I want to follow. If anyone learns a way to do this, please post!