Unhappy PLEASE HELP! ZTE998 Root

Hi,

First off, I have NO CLUE what I'm doing. I'm simply following online directions.

I rooted my ZTE998 using motochopper. I also installed SDK Manager. Problem is when I open SuperSU it says, "There is no SU binary installed, and SuperSU cannot install it.This is a problem!" What does this mean? Have I messed it up???

I am trying to root it so I can install a Brazilian version of android, in Brazilian Portuguese, being that this phone is going to Brazil & also needs to be unlocked. Can someone help me?

PLEEEEAAASSSEEE help me! I'm so afraid I messed it up!!

Specs:
Model #: Z998
Android version: 4.1.2
Baseband version: P983A21B01
Kernel version: 3.4.0-svn11840 zte-kernel@Zdroid-SMT
Build #: Z998V1.0.0B12

Thanks!
Erinna1