If you just want to test your app on your Android device, install the "AppGameKit Player" from Google Play (free) on your Android device. Run it and it will listen for a broadcast from your PC, so they must both be on the same WiFi network. Next click "Broadcast" from AppGameKit on your PC. It will beam your app over to the player on your Android device and it will run inside the player.
If you want to actually build a stand-alone Android app to install on your Android device then you must have the Java Development Kit (JDK is also free) installed on your PC (not JavaScript - that is a completely different thing). Then you can choose "Export Android APK" and fill in the relevant boxes. For testing you just need an App name (e,g, "My Test App"), a package name (e.g. "com.mydomain.myapp"), and give it a file name in the "Output File Location" ending in ".apk".
Just a note - for the package name you don't need to actually own the domain at this point. If you don't own a domain then just make one up but make sure your package name is unique and cannot possibly exist already on your device.
Once you have successfully built your APK file you can copy it over to your Android device via a USB cable or I use Google Drive. The first time you try to install an APK file that hasn't come from Google Play it will tell you that you need to change a setting to allow unsigned apps to be installed. Once you have done that, you should have your app installed and ready to run.