Be sure to check the expiration date of your discount code. Also be sure to respect the uppercase or lowercase, and enter your code without putting space. If you are having trouble, consider clearing the cache on your computer. If your code works, a text will appear, indicating that your coupon has been taken into account. The codes are not cumulative: if you have several, one of them may be used when ordering. After following these procedures and if the code does not work, please contact customer service.