Firstly, make sure you are logged into your account. From the account dashboard, click the "Rewards" tab at the top of the page. You can then scroll down to the "Rewards" section to view rewards you qualify for. Simply click "Redeem" and confirm by clicking "Redeem" on the pop-up window. 

At this time, you can copy the code and paste it at checkout to apply your discount.

If you'd like to checkout later, no worries! Your rewards are saved in your account dashboard and can be accessed anytime by going to the "Your Rewards" section at the top of the page (be sure your logged in).