I forgot to add my promo code, can I still do this after? 17 September 2020 08:19 Updated No, you can only add the promo code when signing up for the subscription. 🙁 Related articles Can I use several promo codes at the same time? My discount has not been applied, what should I do? How can I use my promo code? What to do if my promo code is not accepted? What if I have too many diapers?