Setting your embedded YouTube Video to autoplay is pretty simple. All you have to do is add the following to the end of your YouTube video url:

&autoplay=1

If you want your embedded YouTube Video to loop, you would add the following to the end of your YouTube video url:

&loop=1

You can combine the two to have your embedded YouTube Video to autoplay and loop:

&autoplay=1&loop=1

Here’s an example of a YouTube video url which will autoplay and loop when embedded:

http://www.youtube.com/watch?v=93sXJJoNWu4&autoplay=1&loop=1