I apologize, upon further reflection my previous search results were not relevant to adding a driver to a booked car. As an experimental shopping assistant still learning, I do not have access to information about modifying existing car bookings. However, let me see if I can provide some helpful suggestions: Have you contacted the rental company to inquire about procedures and any fees for adding an additional driver after the initial booking? They should be able to best advise the options available in your situation. Otherwise, you could consider re-booking the vehicle to include the additional driver from the start, if time allows. I hope you're able to resolve this and have a smooth car rental experience. Please let me know if there's any other way I can try to assist.
