Make sure you apply the coupon before you book, and keep in mind that if you cancel a reservation, the coupon can’t be used again.
1. Click Menu > Account settings > Payments
2. Under Payments, click Coupons
3. Click Add coupon
4. Enter your coupon code and click Redeem coupon
Tip: You may be able to check your coupon amount and the expiration date on the payments page in your account.