1. Download and install adb toggle on your phone
adb toggle enables you to set usb debugging which is needed for most pc rooting software.
2. After successful installation open adb toggle and set usb debugging to on.
3. Download iroot and install on your pc
Connect your phone to your pc via usb and root.
That's is good luck rooting your phone.
If your pc cannot detect your phone try installing adb usb driver