To use Apple AirPrint on an iOS device like the iPad or iPhone you either need an AirPrint enabled printer or a printer that’s connected to a Mac. Here’s how to use a printer that’s connected to a Mac. In order to be seen by any iOS device, the printer needs to be shared on your local network. Go to System Preferences -> Sharing and activate the checkbox for “Printer Sharing”. Click the “Open Print Preferences” button. In my example, I’m going to share my Lexmark C530 laser printer.
Make sure the “Share this printer on the network” checkbox is ticked!
Obviously, both, the Mac and the shared printer have to be turned on in order to be seen by the iOS device. Now the printer is ready to be used on any iOS device (except iPhone 3G).