In general we think this store is easy to use. There are a few things that may be more complex or confusing.
How do I apply a coupon code to my order?
When you view your cart, at the bottom left, there will be a button that will allow you to apply the coupon code. You cannot do this later in the process of checkout, so be sure to apply any coupon code or gift certificate you have at this time.
The image below shows a typical checkout screen. On the lower right, it shows the total savings based on the coupon you have appleid.