Q: how can i print from my ipad air

You need a AirPrint enabled printer.

About AirPrint - Apple Support

Some but not all wireless printers have apps that will allow you to print on their printers over wifi. Official AirPrint printers that I have seen tend to be over priced. The other option is to email what you want to print to a computer that is not as restricted and print from there. Unlike many devices on the market today, apple has restrictions that prevent printing directly via wifi without the purchase of a officially sanctioned printer or app. This I would think is for your own protection.