Hi,
If you navigate to the Ask A Question sub forum page (the one where all the Ask a Question threads are listed) you will find a 'watch Thread option' in the top right ish corner.
Click on that, and tick the options as appropriate - email notifications, or whatever your preference.
I have never used the 'watch forum' notifications myself, but would be very interested if you popped back and said how it went? That way it would help anyone else who was interested.