Step no.1
Go to your blog and click on new post type the title of the post
Step no.2
In body of the post click html right after the compose button and past the below code
<div dir="ltr" style="text-align: left;" trbidi="on">
<iframe
frameborder="0" height="450"
src="http://www.facebook.com/video/embed?video_id= 187107111494839 "
width="650"></iframe>
</div>
Step no.3
see this (http://www.facebook.com/video/embed?video_id= 10150844262193566) code and replace the number of video_id with the facebook video code as highlighted with color in the bracket (https://www.facebook.com/photo.php?v=572156712839832&set=vb.339778866041660&type=2&theater)