With these forums, members and moderators have a whole bunch of flexibility is choosing how they are notified about new posts. For a quick start, you need to click on "My Stuff" and choose "My Watch Lists".

Most would want to then click on "Edit Watched Forums" - located on the right side. From there you can select the forums you want to "watch" and also click on "immediately" for "email notification".

Also, you probably want to make sure that under "My Stuff"> "My Preferences" - that you want to check the appropriate box for
"By default should anything added to your Watch Lists be emailed to you?"