Default How To Turn On USB Debugging Without Turning The Device On

Hello Guys,
My Device Is Stuck @ CWM Recovery Screen!
I Want To Flash Firmware Using KDZ Updater. But My USB Debugging Is Turned Off So Any Idea How To I Turn It On? Because IF i Do Not Turn It On KDZ Updater Wont Work And Shows Phone Was Not Found!
My Device - LG E400 L3
Please Help ME!