how do i flash superuser via recovery mode?

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I was trying to install the superuser zip file from recovery onto my nexus s.

http://techie-buzz.com/mobile-news/c...g-nexus-s.html

This is the guide that i followed.

So my bootloader is unlocked.

I have pushed the recovery image over to the phone, but my recovery bootloader just looks the same.

Im guessing this is where it has failed?

PS when i type adb devices it said that no devices where found, but when i pushed the image it said that it pushed fine. any ideas?

PPS when i reboot into fastboot, it makes the sound that its connected, and PDA net is saying its connected but its not showing up under adb devices, and i cant see it in my task manager

Try following these instructions here.