Enable USB Debugging on Samsung Devices

1. On your Samsung device, go to Settings (gear icon).
2. Scroll down and tap Developer options.
3. If you don't see "Developer options," go to About phone or About device and tap Build number seven times until you see the message "You are now a developer!"
4. Go back to settings main menu scroll down and tap Developer options.
5. In "Developer options," find USB debugging and toggle the switch next to it to turn it on.
6. Connect your Samsung device to your computer using a USB cable.
7. If prompted on your Samsung device, tap OK or Allow to grant permission for USB debugging.
8. Check the Always allow from this computer 
9. Tap OK or Allow to confirm.