For the moment, the best you can do is to make a blog post that includes the link (by using the button that looks like a chain link). Even then, it will only present a link, not show an embedded video. I'd like to have more support for video on the site, but that's future work.
How about putting the url in the song information section and letting folks copy/paste from there? Kinda clunky but hey - at least the access can be had from the song.