How can I turn on USB debugging?

To turn on the USB debugging, you can use the following steps.
1) Go to “Settings” -> “System”-> “About phone” -> “Build number”.
2) Touch the Build number no less than 7 times.
3) You will see a pop-windows “Allow development setting?”, click “ok”.
4) Go back to “System” again, you will now find the “Developer options”.
5) Activate “Developer options”.
6) Activate “USB debugging”.