Are you trying to use a coupon code to purchase something and it's not working?
Here is what you can double check:
(1) You MUST be logged in to use the coupon
(2) Make sure you have typed the code correctly... keep in mind it is case-sensitive (copy-paste is a sure thing)
(3) If the coupon is for a specific product, make sure you have the correct product in the cart. It's possible that the coupon doesn't work for certain products (the DYM membership for example).
(4) If it's still not working, it's possible you already purchased something by using that coupon... Double check your account page to see if you have. Each coupon only works 1 time.
(5) It's also possible that it has already expired.
If you still have questions... shoot us an email and ask!