We have finally upgraded the BYC Store to give you a better experience.
We do have some confusion with using coupons.
When entering a coupon, you will need to to view your cart to add the coupon. If you go directly to checkout, they system thinks you are ready to checkout and pay.
If you know your order total will be zero (in cases of special coupons), you will be given the option of free checkout. Just proceed and confirm your order.
If you have added other things to your order or if you have a balance, you can proceed to PayPal to complete your transaction.
Hope that helps with coupon confusion!