You can upload your video onto a website like YouTube or Metacafe, and then add it to your page using the YouTube or Metacafe Widgets.
 

Here's how to add a video to your page using the YouTube Widget:

  1. Click on Widgets > Media > YouTube Video.
  2. Drag the YouTube Video Widget onto your page.
  3. Locate the video you want to display by putting in a URL if you already have it, or searching YouTube for the video.
  4. You can align the video on your page.
  5. Click “Save.”

The MetaCafe Widget is another option found in the same area of the Sitebuilder and works the same.