To stop receiving a feed, you must log first into the website.
Then, go to the "Membership" menu in the upper right hand corner, and select "My Account."
You can then click on "Update Forum Preferences"
and unsubscribe from whichever threads you no longer wish to receive updates about.
Kind advice from your friendly neighborhood Membership Director,
Since we are receiving questions about this and I'm sure it will come up again many times with all of this year's programs kicking off here soon.
If you are receiving emails about posts to threads which you no longer want to receive, it's a quick task for you (the board cannot do this for you):
From the bar across the top: select My Account»
From the window, then select: Forum Preferences»
You will see list of all the forum threads that you are subscribed to. Just select Unsubscribe for all the ones you no longer want to receive email notices about.