Quote from Tesla:
Thank you for contacting Tesla Motors Customer Support.
In order to transfer the Model S into the new owner's name and gain access to the vehicle through the Mobile App and My Tesla we will need the following information.
1. Copy or picture of the Official title or registration of the vehicle
2. Color copy of the new owner's driving license/ID
3. Email address the new owner would like linked to the account (My Tesla email if account is already created)
4. Home or postal address
5. Phone number
You set up your password when you set up your "My Tesla" page.