how do you change the level float in the radiator. The plastic rod has broke off on 2005 BMW 325xi

and not making contact with the bottom of the cap causing the low level light to show up on the car.

Asked by for the 2005 BMW 325xi
With the engine cold, remove the coolant reservoir (two screws securing it)disconnect the electrical connection, turn the sensor approx 90 degrees to remove the sensor.
Thanks I will look at it tommorow