Compilation test

If you've set everything up correctly, you should have no issues compiling the firmware as it is.
Select the PlatformIO icon on the left-hand sidebar and select Build under Project tasks.

Building the firmware

The terminal should open up and show you the current status of the action.
The whole building of the firmware shouldn't take too long and it depends on your computer speed.
If you see a green SUCCESS, that means everything is up and running.

Terminal shows exactly what is happening during each task

Now when you connect your Ringo to the computer via the USB cable and press Upload, the compiled firmware should appear on your phone in a minute or so.
The phone itself will restart and you will get another green SUCCESS text.

The uploading process usually takes a bit longer

You've successfully compiled and uploaded the firmware for Ringo! Bravo!