The discounts offered to you as rewards can be found in the "Available Rewards" section of your Star Chef dashboard. By clicking "Apply", the discount will be deducted directly from your upcoming box. If you decide to skip the week, the discount will automatically be put back into your rewards until it expires. When a reward expires, it will no longer be displayed in the "Available Rewards" section.
Available credits are automatically applied to your next order to save you money.