[Plugin: NextGEN Gallery] Utilizing Description field?

I’ve gone and typed in a description for all of my photos in a gallery, but I can’t see anything that lets me use this field. It would be nice to have the title work as an alt-tag for the thumbnail (which it does) but the description to come up in the lightbox when it is clicked on.

Any idea how I would do that? Here’s my gallery page:
http://tcurranmusic.com/new/gallery

Thanks.

http://wordpress.org/extend/plugins/nextgen-gallery/