Like button, how do I get it to show on the front page?

My site is http://www.biblereading.com. How do I show the like button on post on the front page? I used other facebook plugins before, and they have options to show the like button on the front page posts.

Also, the facebook comment doesn’t show. For example,

http://www.biblereading.com/2011/06/two-promises%E2%80%94the-spirit-in-and-upon-us/

I have the Use Facebook for comments check box checked.

I am getting these errors:

Warning: Invalid argument supplied for foreach() in l/wp-content/plugins/wpmu-dev-facebook/lib/class_wdfb_admin_pages.php on line 421

Warning: Invalid argument supplied for foreach() in /wp-content/plugins/wpmu-dev-facebook/lib/class_wdfb_admin_pages.php on line 422