Kingdom images not displaying

I have just created a website using the Kingdom theme at https://www.madgizmos.com. However, although I have followed all the instructions the product images are not displaying properly. The links work and the image displays after the link has been clicked, but it does not display the product image on the featured products section and each product page.

If someone could please assist me. I would ask that you please give very clear and simply instructions as I am new to wordpress and using themes.