No. Only registered Ryd users who have booked the vehicle can drive it.
Registered Ryd users who haven't booked the vehicle and are passengers of another user booking, cannot drive the vehicle either. You would need to end your booking and they would need to start a new booking to do so.
Allowing non-approved users to drive the vehicle is a major violation of our Terms and Conditions and will result in the termination of your Ryd account.