Open the Settings of the device and type the search keyword admin.
Select one of the found (no matter which) items Device admin apps.
From the list that appears, select Device admin apps.
On the next screen, select Device Administrator.
Then tap on Deactivate.
Done, AllTracker no longer has device administrator rights.
To grant administrator rights, you need to do the same steps as to remove them, only at the 5th step, instead of Deactivate you will need to tap Activate.
You can also enable administrator rights by opening the app and tapping on the red Grant device admin rights button. If this button is green, then the app already has the admin rights.