If you connect a compatible USB printer to an AirPort Extreme Base Station, AirPort Express, or Time Capsule, all the computers on the network, both wired and wireless, can print to the printer.
Before you connect the printer to the device, connect it to a computer and print a test page.
After you have made sure the printer is working properly, connect the printer to the wireless device’s USB port.
On a computer using Mac OS X:
If the computer is on the AirPort network, open System Preferences and click Print & Fax. Select your printer from the list. If the printer is not listed, click Add (+), select your printer, and then click Add.
On a Windows computer:
Install Bonjour for Windows from the AirPort Utility CD, and follow the onscreen instructions to connect to the printer.
Error or status messages may not be available when the printer is connected to a wireless device. For example, you may not get messages such as “Out of Paper” or “Printer Busy.”