The gallery is created using a WordPress gallery.

1. The first thing you need to do is customize the size of your gallery thumbnails. To do this click Settings > Media in wp-admin, and change the default thumbnail size to 202x202px

2. Next you need to upload some images to be used in the gallery. While editing your page, click the “add images” icon, and upload a the collection of images you would like to display. Next click the “gallery” link, and add the WordPres gallery that you would like to display. Make sure you choose “2 columns” and set the “Link thumbnails to:” to “Image file.” Add the gallery to your page. Once added, BusinessCard will automatically convert it into a jQuery slider.

http://www.elegantthemes.com/gallery/businesscard/readme.html