Order Form Impression Count = The amount of times someone clicks on the order form of the product you are promoting. Hops Per Order Form Impression = The amount of hops on average it takes for a visitor to click on the order form of a product you are promoting. For example, if you got 100 hops. 4 out of the 100 clicked on the order form. Then your "HPOFI" would be 25 (4 divided into 100).