there are two stages to installing a wifi printer.
first you must connect the printer to the network router through wifi
then you can install it on the computer
this page shows how to connect it to the network router
you can pretty much start at step 4 if you know the wifi passkey ( the same one that you would use to connect a phone or computer to the internet )
Once that is connected you can run the install cd
the mac should find it automatically if you go to
apple menu / preferences / printers
click on the plus sign at the bottom of the list of printers
it should show the printer on the network and prompt you through installing it.
I can get you my phone number and walk you through it that way if you want to spend a little bit more