Background Slideshow – Only One image displayed

Hello!

I am using the ‘background slideshow’ plugin and I am trying to create a slideshow of about 6 images in the background of my website (http://www.noamhazan.com), but for some reason, when I upload to the featured image on the homepage (as instructed), I am only able to add one.
any idea how to upload more than 1?

I am not very proficient at html and css so go easy on me.

Thanks!