Hi dear if u want to enable usb debugging adb in pattern locked
First of all go to the device manager, then press the boot key of the handset and power key , then connect usb cable, it will detect driver and install it then see in device manager adb interface will be made
but if u dont know the boot key then just press the vol down with power key or vol up or home button with power key, press until you see this adb interface in device manager, then release all
now your phone connected in adb mode
now u can root it if need and can reset or wipe all