Amazon’s Kindle App Store does not include the 3M Cloud Library app, so the app must be “sideloaded.”
Navigate to Options > More > Device > Allow Installation of Applications and make sure it is “ON."
Visit the Cloud Library app download page at SlideMe.org (you can ignore the option to log in). Tap the download link to save the installation file.
To install the app, swipe down on the black bar at the top of your screen check on the download’s progress. When the file is downloaded, tap the link to start the installation process.