Setting a "featured image" to a product.

[Envirolite]

Hello, I'm using a page builder plugin to generate a slider of my featured products from my easycart store. It automatically generates the slider with the correct item names, but the photos won't show up. We were told that in order for them to show, we would need our store products to have a "featured image" the only way that I know how to set a featured image is if each product was its own page on word press. Is there anyway that I can attach a featured image to our products or show their individual pages on my dashboard?