Message: no air printer found

That "Solved" flag can only be set by the original poster (you in this case). You must have clicked somewhere you didn't intend.

The most straightforward answer would be to purchase a printer with AirPrint capability.

Some printer manufacturers provide apps that you can use to print on their printers.

If you have a Mac on the same wifi network, check out a Mac program named Printopia that can forward AirPrint requests to non-AirPrint printers. (There are probably others; that's the one I used to used.)