After creating your order, click DO YOU HAVE CHECKS in STEP 1 on the Cart page? Your available checks are listed in the Selective Menu under the question. You can select the Voucher you want to use from this list and apply your voucher to your order. Since the check you choose is disposable, if your order amount is lower than your check amount, the balance will not be reflected in your account as a check and will be treated as if you used it in full.