Log in to Morningstar, select the product you want to buy and add it to the shopping cart, and select the corresponding Morningstar Promo Code to complete the payment. It should be noted that Morningstar Promo Code has corresponding conditions of use. The way to check the conditions of use is to click Morningstar Customer Center and find My Coupon Code page, then you can browse the Morningstar Coupon and there are usage rules at the bottom of each coupon.