Here's the link with full instuctions.
http://www.yorkietalk.com/forums/yor...file-page.html. If posting the u-tube on your profile page you have to change the address slightly. Basically you, you remove "watch?v=" and replace with "v/". Don't use quotation marks.
One more thing, although you use the "URL" and not the "embed" address for the profile pages, make sure that the "embed" address does not say, "no embedding allowed" this means that you won't be able to post it on the Yorkietalk profile pages, no matter what you do to the address. See the link for detailed instructions with pictures.