You have created an account but it does not link to any devices. By doing an authentication (login) on target devices, you will add it to your account.
How to add device(s) to your account.
1) If you want to track an android devices (Samsung, Accer, HTC...):
See more: How to install on Android devices
2) If you want to track an iDevices(iPhone/iPad/iPad Touch):
See more: How to install on iDevice
Note: After installation successfuly, please wait 15 minutes for the first update.