If you are getting too many forum email messages, you have a couple of options.
The first option, if you want to be able to access the messages but don't want them in your inbox, is to unsubscribe from the forum(s). At the bottom of each email that you can opt out of is a link to either Unsubscribe from this forum or Unsubscribe from all forums. Click the appropriate one and confirm, then you won't receive those messages any longer. You will be able to login and go to the area(s) to read the messages.
The second option, if you have no interest in a given topic, like Teens because you have young children, is to unenroll from that area. To do this, look in the Administration section on the lefthand side. Click the Unenroll me from link. Confirm your action and you will no longer get those messages or be able to read them online unless you enroll again in that area.
A third option is to choose digest in your profile. To access this, click on your name in the upper right corner. Click on the Edit profile tab. Click the Show Advanced button on the right. You should now see an Email digest type line. Press the arrow or click on the text and you should see a couple of digest options. Choose the one you want and you'll get fewer emails from the forums. Make sure you scroll to the bottom and choose Update profile for the change to be logged in the system.