Lotus Bucks can be redeemed for discounts on your next box and free shipping in the exchange store. Just log in to your account and under the Lotus Bucks section click "Use Rewards Code."
Please note that if you are on a "For Life" discount either from being referred by a friend or by redeeming a referral reward, those offers cannot be combined with any other offers. If this applies to you, you will not be able to use your lotus bucks for discounts off future boxes. You can, however, continue to redeem lotus bucks for free exchange shipping.