Featured Settings Question Regarding Slideshows

I am developing a site for a client and am trying to use the BuddyPress Fun theme because of the slideshow capability on the front page. The question I have is that in order for the slideshow to work, do I have to set up the thumbnail options to "custom field"? And if so, what do I need to enter into the custom field key for thumbnails field on the settings page? Thanks for your help!