On the main page, scroll all the way down to the bottom on the left hand side of the page. In the last box it will say "Show my favorite forums" You'll have to go through each and click to keep them. When you get to the one you want to block leave it out. I think it will give you instructions on how to save your favs.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.