http://labnol.blogspot.com/2007/03/how-to-embed-youtube-videos-in-html.html
http://www.thesitewizard.com/faqs/youtube-video-dreamweaver.shtml
http://www.youtubeget.com/yg8.html
Ok those are all tutorials on how to embed youtube videos its pretty easy. Essentially yoou find the video you want. Then copy the code used for embedding the video, its usually somewhere on the page easily obtainable. Once you have the code when you have dreamweaver open, go to the split view. Click on the page view where you want the video to go. This will auto adjust which line is selected in the code view. Then go to the code view and paste. That should be it, a gray box will appear on your page. You cant view the video when its in an edit mode so you have to click the preview in firefox button to make sure the link works.