First you want to download this file from Samsung. This is the USB driver for your computer, assuming you're on a windows pc:
Download the Rar file from this post:
xda-developers - View Single Post - Samsung Exhibit 4G
These should be all you need (you may need to download winrar or 7zip to extract the rar file). Install the drivers onto your computer and extract the files from the Zerg rush root.rar file.
Open up the Zerg rush root folder and execute this file: ZergRushTempRoot.bat
That should be all you need to do. The batch file should take care of everything for you. Just wait for it to finish, it did say it was "sleeping" for me a few times, so just be patient.