Installing the RWY app is no different from any other application.
Tap the Play Store icon on your home screen then tap the Search button at the bottom right. Type "RWY" in the search box and tap Search.
In the list of applications, tap where it says Install.
RWY will now download and install.
After you launch it, you will have the option to sign in or sign up with a one-month free trial.
If you have an existing subscription, choose 'Sign In'. Otherwise start a new trial by choosing 'Sign Up'.