When you book a car on Amovens, you have the option to buy extra driver insurance, which allows one or more people to drive the car besides you as the primary renter. The price of extra driver insurance is clearly stated when you book the car.
If you do not buy extra driver insurance, only you as the primary renter are covered by the insurance and thus allowed to drive the car.
If you did not purchase extra driver insurance when booking the car, it can be done before the start of the rental by editing the booking. Please note that it is not possible to purchase extra driver insurance after the rental has started.