How do I change my 'Shopping Cart Validation' settings?
Step One: Select the proper tool
Click on the 'Payment' link under the 'Order & Payments' heading of the Control Panel menu.
Step Two: Open the Website Settings
Then, click on the 'Website Settings' tool.
Step Three: Edit Validation Settings
Under the 'CART ITEM VALIDATION' heading, edit your cart item validation settings.
Step Four: Don't forget to save
When you are finished, scroll up/down & click the 'Save' button.