How do I print wirelessly without a router using the HP Photosmart 7520?

You can use HP Wireless Direct by touching the Wireless icon from the Home screen, then touching Settings, then Wireless Direct, and selecting On (With Security) or On (No Security). HP recommends enabling security so that only users with the password can print wirelessly to the printer. Note that the Wireless Direct connection supports up to five clients at a time and does not provide Internet access. (Page 4)