On your device, you will be required to have an Apple ID to sign in to the iTunes Store. An Apple ID is the personal account used to access all Apple services such as iTunes Store, Mac App Store and more. Once an account is created, you will be able to download the OfficeMax eBooks (powered by ReadCloud) app from the iTunes Store.
Visit the iTunes Accounts support website for more information.
Visit the Apple ID support website for more information.