Enable adb in your android phone

To use adb with a device connected via WiFi or USB to your system, you must enable USB Debugging in the device system setting under developer options.

Developer options is hidden by default you must make it visible first in order to enable USB Debugging.

To make to visible go to Settings > About Phone and tap on Build number seven times. Return to previous screen to find Developer option at the bottom.

There you go now you have successfully made visible Developer Options, see above in image at 2nd frame.

3rd frame in image, shows about USB debugging options. When you click on Developer options there you have to look for USB Debugging, tap on it will prompt a alert that you can see in frame 4th.

Finally you have successfully enable USB debugging option.