First, click on the “View Cart” link in the upper-right corner of your computer screen. This will allow you to view all items currently in your cart, as well as the quantities that you have chosen for each item.
To change the quantity of an item in your cart, move your cursor to the box that appears under the “Qty” header for this item and type in the quantity desired, then click the “Update cart” link.
Once you do this, the quantity and associated amount will automatically change and reflect the correct amounts for both the quantity and the cost.