To enter the promo code you will need to navigate to the Profile section of your account. In the account tab on the right hand, you'll be able to see the field for codes. Enter the code and click Submit to activate it. That's it!
Please note: The promo code field is typically applicable to students whose teachers are enrolled in the Educational Program with Planner 5D.
If you have a discount promo code, please enter it on the payment page instead.