Q: print from ipad

See requirements for AirPrint and printers that support AirPrint here:

http://support.apple.com/kb/ht4356

If your printer supports AirPrint but does not work then:

Your printer might need a firmware update

Your printer must be on the same WiFi network

Your router must support Bonjour (Zero-configuration networking).

Troubleshooting:

Turn Off iPad, WiFi router (remove from power), and Printer (remove from power).

Turn on WiFi router

Wait 30 seconds

Turn on printer

Wait 30 seconds

Turn on iPad

Try to print.

If you need more help then what model printer do you have?

If the printer is not AirPrint compatible, you will need to use a third party print app. Your printer manufacturer may very well have one in the app store.

About AirPrint - Apple Support