I dont have any actual custom fields under post editor in Social

I am using Buddypress Social Theme and trying to get the Gallery function to work in the Featured section on Home page. Like many others before me I get the gallery with background and the words coming up and down, etc but not the image.

I have been searching threads here and it seems I need to define the custom field in the theme options.

First of all, I don't have any custom field areas like you normally do below the posting editor and if I did, then can I just define anything as the custom field in the theme options or if I leave as 'thumbs' does that mean it will only disolay a thumb sized image in the gallery?

This is the site:

http://www.dancecorner.co.uk/

Thanks for any help
Sue