For the newer Android operating system like Android 4.2 or later,
You can enable USB debugging by the following steps:
Step 1. Enter "Settings", then, click "About Phone".
Step 2. Tap "Build number" for 7 times until you get a note "You are under developer mode".
Step 3. Then back to "Setting", then, click "Developer options".
Step 4. The last step, tick "USB debugging"
