Haven't you got root on your phone but you want to use most of features? No problem! QS Enabler is here for that.
Only Windows is supported at the moment
If you run a Linux distro, it's supposed that you are able to use a command-line utility. You can jump to the instructions for Linux users
Download the ZIP file here
Unzip the file you've just downloaded in a folder on your PC.
Enable Developer Options. To do that you have to go to system settings, open the device info screen (where there is the Android version too), then tap 7 times on Build Number.
On your phone, go in Developer Options and enable USB Debugging.
Connect your phone to the computer via USB cable. If a popup is displayed on your device, click Allow.
Once you've connected your phone to the PC, open the folder where you have unzipped the .zip, execute the run file
On Windows: double click on run.bat
Now you have unlocked all features available without root.
Issues using the app? Check out the FAQ page
You can download ADB here, open terminal in the unzipped folder,
connect your phone, then type
./adb shell pm grant it.simonesestito.ntiles android.permission.WRITE_SECURE_SETTINGS.
Finally, restart the app.