Presuming all the other lights are working (headight, side-lights, rear and brake lights), try the Hazard Warning light switch.
If this gets no reaction, remove the right hand rear fairing panel (by the seat) to find the fuses. There should be a separate one marked "Park", check this with a multi-meter and replace it with another 10 amp one if needed.
If it goes again immediately, or you still get no indicators that suggests bigger problems and someone else will have to help you with that!
