Price discount Amount: Here you can specify an amount that the discount on the product should be. For example, if you put €5 euro here, you will get 5 euro discount on the product.
Voucher Product: Here you can link the product from the checkout with the discount code. You need to do this so it can be listed on the receipt. And if you do not link any product to the discount voucher then it cannot be used. This is because Jamezz then sends discount to the checkout but if this is not created in the checkout then the checkout does not know what to do with it.
Optional Only allow discount when these products are in shopping basket: If the discount code should only be used by customers who have a specific product in their shopping cart specify it here. You specify which products must be ticked for them to use the discount code.
Allow when only one of these products is in shopping basket: If you want to take advantage of the sentence above you must turn this option on. If you do not want to use this phrase above you can just leave it off.