[Plugin: Facebook Comments for WordPress] Facebook Comments Section Title

Does anyone know where I can change the size of the Facebook Comments Section Title?
The fbc options allow us to type in a title, but we would like to use it to display a short instructional sentence. Just want the text to be smaller. A little help as to where I can make the change anyone.

http://insideboxing.com

http://ww.wp.xz.cn/extend/plugins/facebook-comments-for-wordpress/