Adding a tracker via the app is easy!
Just visit the Vehicle List, and press the big "Plus" action button in the bottom right, that will ask you to name the new object, and provide it's unique IMEI. Just like the web version.
When the server receives this data, it will add the object to your account, and return you to the list to see it.
Note: If you have reached the unsubscribed device limit, you will be required to visit the web-version on your computer and add any more with a subscription (https://gator.net.au). Any cryptic error messages about these limits are likely due to this. If in doubt, please "contact our support team on Support"