Adding a product inside of ClickFunnels is hard to find, and easy to do once you figure it out.
Essentially you just need to go to the page that is going to be seling the product, then go to the products tab.
With ClickFUnnels this is the hardest part – finding the tab.
Once found you just need to click add product, and you can add pricing, automation, integrations, etc.
Once someone is on the page you can easily add products to the page using the element selector.
Good luck adding product to ClickFunnels!