I've looked and looked and have come to the conclusion that either a) I'm blind, or b) that there's no way to remove a subscription to certain threads in the forum? There's certainly nothing on the page that lists the threads that you're subscribed to, or on the page of the thread itself. Sometimes you may only want to subscribe to a thread for a while, so it's a bit annoying to keep getting game messages once you no longer have any interest in it?