Does this mean that I can only use YouTube?

You can use the following service providers to show your videos on this website: Archive.org, Blip.tv, Brightcove, Dailymotion, Google, GUBA, IMEEM, JumpCut, Last.fm, Live Video, MetaCafe, MySpace, Revver, Sevenload, Spike TV, Todou, UStream.TV, Veoh, Vimeo, Yahoo and YouTube