problems at the instalation

I’m new at this, so I beg for mercy.
Ok. I have a Mac Book Pro 5,3 with an NVIDIA GeForce 9600M GT with 512 MB VRam.
I tried to install Cuda like in the Getting_Started_Mac.pdf written.

  1. Uninstall Toolkit and SDK
  2. Install Driver
  3. Install Toolkit
  4. Define the environment variables
    And here is the Problem. When I copied “export PATH=/usr/local/cuda/bin:$PATH” in to the Terminal nothing happened . When I wrote “sudo export PATH=/usr/local/cuda/bin:$PATH”, an error appeared:
    “sudo: export: command not found”
    At this point, I’m pretty helpless, so it would be nice, if anyone could help me.

Regards RobertG1