Professional prints can be ordered from the app as long as the selling feature is enable for that specific photo.
Your clients will follow these directions to order prints through the app:
To order a print, select a photo and tap on the Order Prints button on the lower right corner of the photo. The next screen you will see will allow you to select a paper type, size, and quantity. You can then add it to your cart or check out. Checking out will allow you to confirm your order and make necessary edits to the order or even remove it. Once you've confirmed your order by selecting the Checkout button on the upper right corner of the screen, you will then be prompted to enter your credit card information, the type of shipment, and shipping information. Once that that information has been submited, you're all set. You will receive a confirmation email verifying your order. When your order has shipped, you will receive another email confirming the shipment along with a tracking number.