From your desktop you can click on the "Earn Rewards" Button on the bottom left of the screen. Not mobile and tablet devices may not be able to see the icon.
This will open the rewards dashboard
Click on login or create account if you haven’t registered before.
Once you have logged in it will show you an Account Details page
Click on “Earn Rewards” and the Rewards Menu will appear. The top left hand side show you the number of points you have. Click on the reward you would like on the right hand side.
Click on the reward you would like on the right hand side and click on Redeem.
This will give you a coupon code to add to your order.
When you check out your order you can add this code to you the “Discount” section of the order.