Default [Q] How to root LG G2(D802) running 4.4.2 kitkat

Hello all I'm a complete noob at rooting and such on an android. I have researched and found this link: I tried to follow all the instructions but I would always fail. Everytime i open the root bat file, the bat file just disappears after i press any keys. Pleease help i hate the lg skin and want to install cyanogenmod!!!