To use the coupon codes, click on the GET THIS DEAL button above. When clicking the button it copies the coupon code to your clipboard ready to paste at the checkout. Look for a field that says “Got a coupon code” or something similar and paste the code there to redeem.
Some promotions don’t require a code but access to a special landing page. You need to click on the GET DEAL button and it will take you to the correct page with the discounted price.