To view the contents of you cart, click on the "view cart" icon in the upper-right corner of your computer screen. Once you click on this icon, you can easily change the number of copies you want to purchase of a particular item in your cart by updating the quantity listed and then clicking the "Update cart" link. You can also delete any item in your cart by clicking the "Remove" check box to the left of that item and then updating your cart with the "Update cart" link.