From a computer:
Click the Instrument: Style listing above the level indicator near the top of the screen.
Choose your Instrument and click Make This My Path under your Style choice. 
Click the Back button to return to the My Path screen.
From a tablet:
Tap the Instrument: Style listing above the level indicator near the top of the screen.
Choose your Instrument and tap Make This My Path under your Style choice.
Tap the Back button to return to the My Path screen.