To insert a YouTube movie in a post, you must find out the id of that movie. The id can be extracted from the movie`s link. E.g.: if you want to post the movie http://www.youtube.com/watch?v=wqi_BVD2XiI, the id is wqi_BVD2XiL and you must include [youtube wqi_BVD2XiI] in the post.
It`s practically all about [youtube id]. More details here aici.
