Add the following to the beginning of the embed code,
Then add the following at the end of the embed code.
<div align="center"><iframe width="440" height="250" src="https://www.youtube.com/embed/DW1lxwsK5_Q" frameborder="0" allowfullscreen></iframe></div>
Once you get that code, you can then add a new Media/Widget asset to one of your guides and paste that code inside. The feed should then display on your page.