The AirPort Utility has been updated for Mac OS X Lion to version 6.0 You can download the update directly on your device through the Apple Software updater.The AirPort Utility lets you set up and manage your Wi-Fi network and AirPort base stations, including AirPort Express, AirPort Extreme, and Time Capsule. It allows you to 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.
You should receive an automatic notification asking you to update. You can also manually start the update by clicking the Apple logo on your desktop and selecting Software Update.