How do i pay barns and noble with a gift card?

My cusin knows that i love to read so he got me a barns and noble gift card but there arent any barns and nobles by my house so i decided to use it online but i dont know how to pay with it online. so i was just wondering if you know how to use it online? and if you can pay shipping with the card?|||Go to barnesandnoble.com or bn.com, click on "Gift Cards" and "Redeem A Gift Card".