See 
Figure 1. With the vehicle started and in neutral, press and hold the reverse switch in the right side controls until the reverse lamp illuminates. 
With fairing: The lamp in the tachometer indicates that the reverse is enabled. See 
Operation → Instruments. 
Without fairing: The lamp in the speedometer indicates that the reverse is enabled. See 
Operation → Instruments. Release the reverse switch. The neutral lamp turns off when the reverse lamp turns on.