====== Adding a Youtube video with an HTML Video block ======
  - Browse to youtube.com
  - Find the video you want to embed in your site, and display it. 
  - Click "share", then "embed". There will be a text box with code selected. Copy this code.  It will look something like this:

<code>
<iframe width="560" height="315" src="//www.youtube.com/embed/XervzRyXukY" frameborder="0" allowfullscreen....
</code>

Now go over to Sitemaker to insert the video.
  - Click on the "insert" (+) icon, and choose the HTML snippet object. 
  - Click on the "Setup" tab,  and insert the code you copied in the resulting box. 
  - Save the changes. 
  - Resize the window if prompted.