Many people have trouble with reading. Reading well takes time, patience, and practice! The most important thing to figure out is the purpose of your reading: looking at instructions to build furniture and studying a textbook are not the same thing! Once you’ve figured out your purpose, you can choose to focus on what are known as intensive reading techniques that stress things like vocabulary and speed, or instead on extensive techniques that will help you engage with the meaning of a text in a deeper way.

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.