How to Fix the USB Debugging Greyed Out

Hi All,

Please help me to enable the USB Debugging below as it was greyed out.

i am providing the details of my mobile below

Mobil: Samsung Galaxy S4 SGH l337

Android: 4.4.4

Baseband Version: l337UCUFNJ5

Kernel Version: 3.4.0-2960651

dpi@SWDE2213 #1

Build Number: KTU84P.I337UCUFNJ5