Mac OS X 10.6: Setting up an Apple wireless device
You can set up your AirPort Extreme Base Station, AirPort Express, or Time Capsule to share your broadband Internet access with wireless computers on your network.
You can also set up your AirPort Express to use AirTunes to play music from iTunes on your stereo or powered speakers, and share a Universal Serial Bus (USB) printer.
To set up your wireless device:
Connect the appropriate cables to the ports you want to use, including the Ethernet cable connected to your digital subscriber line (DSL) or cable modem (if you are connecting it to the Internet), the audio cable connected to your stereo (if you are using AirTunes to play music from iTunes on your AirPort Express), and a USB cable connected to a compatible USB printer (if you are printing to a USB printer).
Plug in your device to a wall outlet.
Open the AirPort Utility (in the Utilities folder of the Applications folder) and follow the onscreen instructions to set up your wireless device.
AirPort Express is compatible with powered speakers connected to the stereo minijack. You cannot use powered USB speakers with AirPort Express.
For more information about using AirPort, open AirPort Utility and choose Help > AirPort Utility Help.