I'm guessing you're looking for air print printers. just because one is new doesn't mean it's an air print printer. If your printer isn't on the list then your choices are to take it back for one that is, or find an app to make it function. (presuming it's a wireless printer)
Air Print basics
Using the same assumption as Skydiver119, this is NOT and Airprint printer. If you want similar functionality without an Airprint printer, you can use something like Printopia (http://bit.ly/Ue0txZ) but keep in mind your computer must be on in order to share the printer with your devices.
If you're having a different problem, please try to be more clear with the problem your having and we can maybe help.