You have 2 options..
a) If you entered your email address and phone number in step 7, then the discount associated with that email or phone number will be visible. The available options will appear on the left hand side of the page. Select the discount you want and then APPLY SELECTED OFFERS. The discounts will now appear in your order summary.
b) If you are trying to upload a printed coupon for use on the site, click here and enter your email address. You will be taken to a page pictured below. Click the blue plus sign and enter the 8 digit MO code or barcode on the coupon.