I have filled my maximum number of threads that I'm allowed to watch at one time.  How do I clear out all of the old dead ones.

after you click on User CP, you will see 3 tabs on the left side, message, profile and posts. click on posts and the list underneath it will change and one of the choices will be view my notifications. If you click on that you will see a list of all your watched threads on the right.  On the same line with a thread you want to remove, click the checkbox under Remove. do the same for all threads you dont want anymore, or scroll to the bottom and check the  box labeled "check all" if you want to clear them all. then scroll to the bottom of the page and click on the button labeled "Update Notifications" to apply your changes.