It depends on the type of discount code you would like to use:
• For coupon codes redeemed from your rewards points: You can definitely add the discount to your next recharge. Go to your subscription management dashboard, add the code and scroll down to select "APPLY DISCOUNT".
• For sitewide seasonal promo codes: Such promotional programs are not applicable in conjunction with subscription orders, so these codes cannot be added to your auto-recurring orders. Since the default discount you receive from subscription is already as good as the seasonal offers, you don't need to worry about missing out any hot deals at NuBest website!