After entering your email address and selecting your plan type (Monthly, Yearly, or Lifetime) the checkout process will begin. In the payment details window, there is a form reading "Enter coupon code." 

If it fails to enter the coupon, please continue with the checkout process and, once completed, contact us at with your account's associated email address so that we can apply the coupon for you! You will not be charged until the end of your 14-day free trial unless requested otherwise.