Before you can download an ebook to your desktop/laptop or mobile device you will need to create an account with the vendor who offers the ebook.
The vendors are:
When you click on an ebook you will then need to sign in to either platform (top right of screen).
Next, you will need the proper "reader" to read the book --
adobe digital additions (desktop/laptop)
Once you have download you can follow the steps to download when you click download.