setting up imac for airport



i have installed my airport card in my imac, and i already have my powebook set up with an airport base station. How do i make it so i can use my imac with the same base station? i tried using the setup assistant to join an existing netword but when it asks for the password, i put in the same one i used to create the network on my powerbook and it said its the wrong password. I have also tried other things but it always asks for the base station password and im sure im typing in the right one but it always says its wrong. can anyone help??

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