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