VR is a small device INSIDE of your car. Must open the car body/case to see it. It is located in the front near the steering rod. A small cylinder shape thing with 3 teeth. You must dissemble the whole car to change it.
However, small 震 is normal for MiniZ due to electronic interference from TV, computer, lights in your house.
If very very 震, then your VR is damaged or loosened.
Changing VR needs to 焊電線. So I hope your car is not very very 震.
