My Last Resort -- I can't my Nexus S bootloader on Mac.

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I know it's probably been talked about a lot, but I've spent literally all day, Googling and searching through different threads -- they all say the same vaige bs as the next.

Facts:

Nexus S -- 2.3.4
Mac OS X 10.7

I want to unlock my bootloader and root the phone.

Problems:

I downloaded the SDK, installed it(at least I think I did, see? VAIGE instructions), put the phone in debugging mode, turned it off, booted into the bootloader(black screen with giant android), then opened terminal and type fastboot devices -- nothing shows up, cannot find, doesn't exist.

This is what I get -- -bash: fastboot: command not found

I'm not here to waste time, I'm sure it's a simple thing I'm missing.

On Windows or Linux, you would use "fastboot devices"'.

On OS X, you use "fastboot-mac devices".

fastboot-mac oem unlock