You can use the setup assistant in AirPort Utility to create a new wireless network.
The setup assistant guides you through the steps necessary to name your network,
protect your network with a password, and set other options.
If you plan to share a USB printer or USB hard disk on your network:
Connect the printer or hard disk to the AirPort Extreme USB port (d).
Open AirPort Utility, located in the Utilities folder in the Applications folder on
a Mac, or in Start > All Programs > AirPort on a computer using Windows.
If AirPort Utility isn’t installed on your computer, you can download it from
Select your AirPort Extreme and click Continue.
If you don’t see the base station you want to configure, click Rescan to scan for
available base stations, and then select the base station you want.
Follow the onscreen instructions to create a new network.