You need to be logged in to this website to be able to view the PDF/Ebook that you purchased. You should also have downloaded a password-protected copy to your computer/phone which you can view without an internet connection and share with any devices that you own, i.e. your laptop, tablet, smartphone, desktop, etc. Note that your copy needs to be downloaded and stored on your storage device within 7 days of purchase.
Whenever you purchase a printed book from Amazon you can send a request with proof of purchase to email@example.com for the digital copy.