This guide provides the code needed to embed newer Youtube videos which do not have an option to use old embed code.
Here is the code snippet needed:
<center><object width="853" height="480"><param name="movie" value="http://www.youtube.com/v/-lMKVNi1kck?version=3&hl=en_US&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/-lMKVNi1kck?version=3&hl=en_US&rel=0" type="application/x-shockwave-flash" width="853" height="480" allowscriptaccess="always" allowfullscreen="true"></embed></object>
All the you need to do is replace the -lMKVNilkck which is found twice within the above code snippet above replace this with your own letters found at the end of the your own Youtube link. The <center> tags can be removed if you do not want the video centered on the page. The width and height can also be changed to your liking. Common width and height ratios are 560x315, 640x480, 853x480, 1280x720, etc. Copy and paste the code into your listing using the html editor tab. That is it.