A separate TeslaFi.com account is required for each vehicle. Another TeslaFi account can be created by logging out and choosing the signup option. During the signup process you can select the vehicle you want to log on the new account. The logged vehicle for each account can also be selected in settings->account->vehicles.
Multiple TeslaFi.com accounts can be linked together from Settings->Account->Vehicle->Create A Fleet Account. Once a fleet account is created a new menu option will appear titled 'Vehicles' from the menu bar where you can easily switch between accounts and manage your fleet account.
Customer support service by UserEcho