To claim your Trail's End Reward within the app, first login and open the menu using the 3 lines in the upper left hand corner. Select "Rewards" from the menu. On the "Rewards" page, click on "Gift Cards". If you have an available gift card, there will be a button to claim in the bottom right of the screen. Clicking this will claim your gift card and send you an email with a code to use at Amazon.com. If you need to have the code resent at anytime, you can click on "Email Gift Card History" on the same page.