Yesterday, I purchase a TAB M10 and cannot find a manual on how to download an ebook which is my only purpose for the device.

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Hi Paul,

Thank you for waiting!

Is the TAB running on Windows?

Dear Paul, It was a pleasure helping you with your Lenovo issue today. Here is a summary of the resolution.
Issue identified :

Assistance on how to get books to work on the Tablet.

Solution Implemented :

Call customer

Found that the tablet is running  Chromium

Assisted in downloading Kindle app from the google play 

Installed Kundle to the tablet and Advised customer that it is the app for downloading / Purchasing and reading books

Answer accepted

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