Hi Rick,
That field only accepts coupon codes.
Please hit the blue "Checkout" button in the bottom right of the picture you posted. It will bring you another page stating "My Account Summary". Once you`re at that page, hit the orange "Checkout" button just below the total price of your cart. It will bring you to the "Shipping/Billing Info" page. You enter your shipping, billing and payment information. Near the bottom of that page, you will find a field called "Other Information" as shown below:
That will be the field you will enter your coupon code.
That should work for you. Please let us know if you have any other issues.
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