Where do I enter my promo code?

Promo codes must be entered on the checkout screen to be applied to your order. 

On iOS:

The Promo Code field may be found on the Checkout screen between your contact information and the price breakdown.

On Android:

The Promo Code field may be found by tapping the Have a promo code? link between Payment Information and Paper Type on the Checkout page. Type in the code on the dialog window that opens and tap Apply to finish adding your code.