How do I use HP Wireless Direct to print without a router on the HP Photosmart 7520?

From the Home screen, touch the Wireless icon, touch Settings, touch Wireless Direct, then select 'On (No Security)' or 'On (With Security).' HP recommends turning on 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)