The forum GalaGirl linked to is really for discussing forum guidelines and features, and issues about them, but for some reason, people started asking for threads to be deleted there. Mods generally don't delete threads, but maybe they can do it for duplicates.
You can contact the mods several ways:
, or AutumnalTone
Click the "Contact Us" link at the very bottom of the page
Click the red triangle at the top of the first post in this thread and "report" it.