Here's how to use Discount Codes when shopping in HBO Max: add new products to the HBO Max shopping cart and click the checkout. Log in or create a new account to HBO Max by entering details, then click Continue to pay. Below the listed items, you will see a box that says Add Coupon, choose the HBO Max Discount Codes you are going to use and then the website will automatically return to the checkout page. Now you will see your actual total payment at hbomax.com.