In addition to the order confirmation email, you can also check your order within the app. To do so, go to the Store tab, tap "My Orders", then tap the order in question. From this screen, you'll be able to check the contents and shipping address of your order.
Please note that your order can't be changed after it’s been placed. If less than 4 hours have passed since placing your order, you can cancel by going to "My Orders" in the upper-right corner of the Store tab. After canceling, you can edit and place your order again.