To place your own video in your site:
• Post/upload your video on YouTube, DailyMotion or Vimeo. You can set your video as unlisted or public if you desire.
• In SimDif, 'Add a New Block', tap on the "Special" tab and select the Video block.
• Once the block has been created on your page, open it and paste the address of your video to link it on your page.
Watch the video tutorial:
How To Add A Video