It doesn't sound like you're in the right spot.

click MY ACCOUNT > FORUM SETTINGS > Thread Subscriptions/MyForums

There you should see a list of your "My Forums". Now scroll down below those and you will see a list of Thread Subscriptions with two options: 1) A check box to subscribe 2) A check box to receive email

If you deselect the email notifications that are currently selected you will stop receiving emails.