I have tried many plugins, but they all cannot do what I want.

I am using the content share theme "me gusta" and mostly posting images. I want the images to appear on the facebook fanpage, however when it posts to the facebook page, the plugin cannot detect the image on the post (probably due to the theme using something since it usually is supposed to post the image).

This is a demo of the theme: http://freetotry.me/megusta/