You might wish to enable usb dubugging for Samsung Galaxy S4, S5 or Galaxy Note 10.1 (2014 Edition) for a number of reasons. For instance, if you are an Android App developer, this is a must-have features to enable sideloading of your app to your device. Or you might find that you can not find your device in Eclipse, where you want to click “Run”, then your app is uploaded automatically then fired with a single button click.
Enabling the USB debugging feature is not easily found in the latest Galuxy S4, S5 and note devices. Here is how to do that:
Go to Galaxy settings, then System Tab –> then Click “About Device” icon