When editing a page, click the HTML tab at the bottom of the editor. Find an appropriate place in the page and paste this in.
<iframe width="560" height="315" src="https://www.youtube.com/embed/_qPMfGskpCI" frameborder="0"></iframe>
Replace the “_qPMfGskpCI
" with your youtube video identified.
You can find the identifier while watching the video in your browser. Its the text following the ?v=