There wasn't one installed when I bought my Macbook Pro so I had to buy one seperately and I'm just wondering how to install it?
All MacBook Pro's have built-in AirPort Extreme cards. Was the original defective and removed?
If it's just the part, you can find a repair guide at http://www.ifixit.com/.
Otherwise -
All I know is that I can't get any wireless connection. I can only get a connection through ethernet. It says "Airport Card Not Installed" when I click on the connection thing on the upper right hand corner of my screen. So I bought a new card and now I don't know how to install it.