If you search youtube and find your video you'll see the link at the top of your browser will have: http://www.youtube.com/watch?v=KGlVooFwPq4
Right under the video you see: thumbs up, thumbs down, Add to, Share, Embed. Share will give you the link http://www.youtube.com/watch?v=KGlVooFwPq4 to copy and paste but it won't display the video. What you want is the Embed option. Click the embed option and the text should already be highlighted, if not click at the end of the text and drag to the beginning, it'll be blue background white text when done right. Then click Ctrl+c on your computer. This is the default copy command on your browser. Then all you have to do when you want to post it is click Ctrl+v in your Post a Message box. This is your default browser paste command. Experiment :) .
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~Ryan
"I play the harmonica. The only way I can play is if I get my car going really fast, and stick it out the window." - Stephen Wright
Pennsylvania - H.A.R.P. (Harmonica Association 'Round Philly)