Responding to a comment in the Support page

Hiya. I'm trying to respond to a comment in the Support section (the comment is an answer to a question that I myself made to Support), but there's no button/icon anywhere to allow me to do this. How do you respond to a comment!?! Also, when I originally sent the question I indicated that I wanted to be emailed when a response to the question was made, but this never happened (I had to go back into the Support section and find my question through a search). What might explain why I didn't get the email (it's been the same thing with all other questions of mine as well)? Thanks for your time--I'm very confused here.