AirPort Utility 6.0 for OS X Lion
Use AirPort Utility to set up and manage your Wi-Fi network and AirPort base stations, including AirPort Express, AirPort Extreme, and Time Capsule. See a graphical overview of your Wi-Fi network and devices. Change base station and network settings, or manage advanced features such as security modes, wireless channels, and more.
For the latest information on AirPort software, check Software Update in System Preferences or the following Apple website: Apple Support Downloads
Learn more about Apple Wi-Fi at: http://www.apple.com/wifi/