I think you are understanding the topic of this thread correctly. In order to get an e-mail notifacation that a response to your post has been made, your post can not have been made using "Quick Reply" (the box at the bottom of this page is a quick reply) You must click on "Switch to Full Reply" or use "Quote". You will then see "post options" below the text box. You should see "Add this thread to my Watched Topics" checked. Now if your "Preferences" under "My stuff" is set to "Yes" under the heading By default should anything added to your Watch Lists be emailed to you?
You should receive a notice.