Head over to Sites > Funnels > then choose the Funnel you wanted to add the product to and click on the Checkout step/page
Click on Products tab then + Add Product
Choose the Product and it's corresponding Price then hit Save
How to Add a Product in a Check out Page Inside a Funnel
If you are looking for a way to add a Product in a checkout page, here's how to do it.
Updated over a month ago