Most likely no one will look it up, you're better off posting the link, or the video itself. Copy the URL from Youtube. Right above where you type you will see an icon that looks like movie film, second one in from the far right. Click it and paste the URL from youtube into the box that shows up. Hit ok and add any text you want, or just post it.
If you aren't sure what a URL is, it will look like this ~~>http://www.youtube.com/watch?v=J02MCXxqCNk&feature=related<~~
Sometimes after 'http' you will see and 's' like this 'https'. If you see that, when you paste the URL take out the 's' or it won't post, it will only make a black, blank screen.