Captions on Gallery Photos

Hello! I am trying to add captions to photos in our Image Gallery. We use the Highend WordPress theme. I read on other posts that this should be working now after a recent update. However, it is still not working for me.

I put descriptions on a few of the pictures in our gallery but they don’t show up.

http://estelarcr.com/wp/en/image-gallery-2/#prettyPhoto

Thanks!