If you are subscribe too that thread, it will say unsubscribe. Also from the the line above that you will see the words-- Home, Forums, active post, new post, gallery, garage, tool, and insurance.
move over TOOLS and you will get a popup menu , pull sensor down to quick links, a new menu will popup, move sensor down to Subscribe threads, click on it . This will show all threads you are subscribed too
on the right of this page is notifications, click that box and go to the bottom of page click unsubscribe and that all the threads you are subscribed to.