sharing videos

Ken from Greer,S.C. writes: You guys and gals at World Start are great when it comes to electronics so I hope you can answer my question. I like to share videos (like YouTube) on Facebook and especially in email. When I click on a video link I receive via email it goes straight to big screen and begins playing. When I share from YouTube it goes to the YouTube page with the smaller version. How do I get the link to go to full screen and auto play?