Facebook like code

I'm trying to figure out to add my facebook into the code
<iframe src="//www.facebook.com/plugins/like.php?href=smt_social_url&send=false&layout=box_count&width=50&show_faces=false&action=like&colorscheme=light&font&height=65&locale=en_US" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:50px; height:65px;" allowTransparency="true"></iframe>

for the facebook like- where do i add my facebook link?

All good i found this https://developers.facebook.com/docs/reference/plugins/like/ to create it. Thanks.