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Entering coupon codes is very easy to do on the Walmart website. You will enter the coupon codes at checkout in the box marked codes.
You can either print the coupon or enter it during check out.
On the checkout page you'll see a 'Voucher Code' field where you can enter your coupon code.
Please give more detail what kind of coupon?
If your order is a minimum of $50, just enter the coupon code "SHIPFREEUS"