There is a setting in your profile on the left called Notifications. Go there, and make your selections. You can globabally turn off all notifications.
You can also unsubscribe yourself en masse to all threads you may already be subscribed to (but weren't receiving notifications since I turned it off).
1) If the forum does not behave as you expect it to based on your settings, please report it.
2) If you get a notification from before today, April 14, please report it.