additional advantage along buy cart checkout during e-course financial option product products promoting provision set-up show

I'm trying to understand and set-up promoting my additional products during checkout! I created a product called "Product Test" and I am trying to add my financial advantage e-course, but it doesn't show up in my e-junkie cart with an option to buy along with product test. What am I doing wrong??

We don't have a provision of promoting products in the cart.