If you are going to post videos using your phone, you have to make sure that your aren’t using the mobile version of youtube. http://m.youtube.com/index?desktop_uri=%2F&gl=US#/watch?v=kDjIRefTuso
See the M at the beginning of the link? That means your in mobile mode and thats why the videos aren’t embedding automatically. I had this same problem before.
I was able to watch the last one though. Your getting better! You should try using shorter string, it really does help. Good job