To embed youtube videos into posts you need to use either the fimstrip button in the editor or can surround the video link with the video bbcode. For example:
and you will get this example from a debate on Roman Catholicism with James White. [video=youtube;LXeb-x63wGI]http://www.youtube.com/watch?v=LXeb-x63wGI[/video]
PHP:
[video=youtube;LXeb-x63wGI]http://www.youtube.com/watch?v=LXeb-x63wGI[/video]
and you will get this example from a debate on Roman Catholicism with James White. [video=youtube;LXeb-x63wGI]http://www.youtube.com/watch?v=LXeb-x63wGI[/video]