superuser

There's nothing in the instructions that speak to a "superuser" file.

If you achieve root on your device, you'll see a new application called "superuser permissions." If you download a program that requires root, it will ask you if you want to give it superuser permission.

Follow the directions for using the unrEVOked method. Once it gets started, it takes but a couple of seconds to see the word "done" on your computer screen. At that point, you have root.

You have installed the SDK kit on your computer's hard drive root directory, haven't you? If you don't have the drivers installed, it doesn't work.