Make sure that your project is correctly setup in the ContentManager and works fine on Windows. Ask your programmer or technical person in your company if this is not your expertise (everyone in a team can use the AppBuilder and ContentManager). See below for details!
Start the AppBuilder and select Android as the target platform.
Click the Start Build button and report problems back to your programmer (or artist if content is missing for the target platform). If you are the programmer, ask in the Forum for help. Right click on the output to copy it to your bug reporting tool.
When the build succeeded click Launch to deploy the application on the connected Android device (make sure your Android device is connected, drivers are installed and have debugging enabled, see below for details).