Bing search results on 'edit YouTube videos':
http://www.bing.com/search?q=edit+youtube+video&form=MOZSBR&pc=MOZI
Thank you, but I’m not interested in editing my own videos—I want to edit one of Bill’s. That would require his consent, and then I’d have to download it somehow to an MP4 format, then edit it in Moviemaker or something.