If you want to add another tracker to your account, all you need to do is make sure you are logged in to the account then follow the activation instructions by visiting www.drivepro.io/activate/   You'll need to enter the account password and the activation code for the new tracker and after a couple of seconds, you'll see you have a new vehicle added named something like 'My Vehicle 1234', the last 4 digits will match the last 4 digits of the IMEI of the new tracker.