From the Home screen, drag down the Notification panel.
Tap the Settings icon.
Scroll to About phone.
Tap About phone.
Tap Build number seven times.
You may be prompted to enter your device PIN or password. When Developer options has been enabled successfully, you will see a message at the bottom of the screen which states Developer mode has been enabled.
Swipe from the left or right edge of the screen.
Tap System.
Tap Developer options.
Scroll to USB debugging.
Tap or slide the USB debugging switch to ON.
Tap OK.
You've completed the steps!
