Never mind, I figrued out what I did wrong, you have to place it inside the " " not between. Thanks Zeh. for the tip
You need to add it twices lols! Some times it will have more than a url on it! The url will have a " in the end of it still you that the end so you add the &autoplay=1 right by the (") It's the simplest I can tell you for you to look for the end of the URL there is two and the same url too! so look careful!