Hi there and welcome
to do this, on the iPod go to the app store and install the app
HP ePrint, that you see here
Make sure you have the iPod connected to the same wireless network as the printer and open the app.
From within there you can then print
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.