Again, there are two methods currently for unsubscribing yourself from a document or discussion thread. The first way is to enter the document/discussion area in the conversation area and selecting ‘Unsubscribe’ option (found above the comment box at the top centre of the page). Once selected you will no longer receive notifications on this conversation unless you choose to subscribe to it again.
The second method is to unsubscribe by email - open a notification email you have received relating to the thread you wish to unsubscribe from, and select the ‘Unsubscribe from this conversation?' link found at the bottom of the email.