My b2evolution Version: 4.1.x

Can someone help me with this? I'm trying to get a YouTube video to open using prettyPhoto (http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/#!prettyPhoto) and having no luck.

This is the code YouTube gives me:

<iframe width="560" height="315" src="http://www.youtube.com/embed/x5u6ZA4PPNI?hd=1" frameborder="0" allowfullscreen></iframe>

How can I get this to open in a prettyPhoto box? Is there an easy way to do this?