Embedding Youtube videos in your content pages is a relatively simple process. First, locate the youtube video you would like to embed. Then, right-click on the video, select the 'embed code' option from the drop down menu, copy the code, and paste it into the content editor on your site. Be sure to click the HTML button prior to pasting the code.

<iframe width="640" height="390" src="//www.youtube.com/embed/Example1234" frameborder="0" allowfullscreen></iframe>

You also have the option to adjust the width and height of the embedded video. In the above example the width is set to 640, and the height is set to 390, you can set these to numbers to better suit the needs of the video on your site.