First, Click on the "Cart' icon on the upper right of the webpage. This will allow you to check all items that are currently in your shopping cart. To change the quantity of an item in your cart, move cursor to the number box which is next to the product description. If you want to increase the quantity click on the arrow up, if you want to decrease the number then you may choose arrow down. Once you do this the quantity and the associated dollar amount will automatically change and reflect the correct amounts for both the quantity and the total cost.