Default Help me root my at&t samsung galaxy s3 sgh-i747 android 4.3 jellybean!!!

I am a noob so please bare with me.
My device's information (what I know it is) : AT&T Samsung Galaxy S3 SGH-I747 running Android 4.3 Jellybean.
My laptop is super slow so it is hard to download files.
I put USB Debugging.
I downloaded Odin3 v.3.07
I downloaded CF-Auto-Root-d2att-d2uc-samsungsghi747
I also downloaded SAMSUNG_USB_Driver_for_Mobile_Phones_v.
I put the PDA file and everything.
It even says, "<OSM> All threads completed. (succeed 1/ failed 0)"
It also says," PASS! 02:17"
I checked Auto Reboot and F. Reset Time.

The problem is that I know Supersu is supposed to be installed but it is not.
And Root Checker says it is not rooted.

Someone help! What am I missing?