After you select a resort, choose your travel dates and click "Book This Trip," you'll be taken to a page called Review Your Trip. This page will show all of your trip information including your selected hotel, flight options, add-ons and more. Scroll all the way passed those, to the bottom of the page. Once you get there, you'll see a little text box on the bottom right side of the page where you can fill in your promo code ("Promotional Code")–enter your promo code and click Apply. In case you don't automatically see this text box, just click the little expand arrow next to "Promotional Code" and it should appear. And voila! You're all set to continue booking your vacay.
Check our Promo Codes & Travel Coupons page for a list of active promo codes.