Here's how to turn on your email notifications:
1. Go to USER CP (it's on the right sidebar, where it says "Welcome back" and your name. Just click on the words USER CP)
2. On the left sidebar, click EDIT OPTIONS.
3. The second box down is "Messaging and Notification." Look for the DEFAULT THREAD SUBSCRIPTION MODE box. Make sure that you choose "Instant Email Notification."
4. Scroll down to the bottom and click SAVE CHANGES.
That's it