Socail them/HomePage Featured Block

I have an install that I am testing buddypress social with. I have the featureblock activated, and have the posts showing, but no image is appearing in the featured block. The demo image is. Can I change this image? Must it be static, or can it be related to the posts showing in the gallery or article thats bbeing used by the featured block style.

There doesn't appear to be an obvious place to change the image - it just defaults to the original image in the default theme setup - do I just need to FTP an image up and over it?

askfab.fabulousyarn.com

Tks

j