How do I use the HP Envy Photo 7800 without a wireless router (Wi-Fi Direct)?

Make sure Wi-Fi Direct is enabled by opening the Dashboard and touching the Wi-Fi icon to check its status, network name, and password. By default, Wi-Fi Direct is set to 'Automatic' mode, which allows anyone in wireless range to connect without a password. For higher security, HP recommends changing the connection method to 'Manual' and setting an administrator password through the printer's embedded web server (EWS). (Page 2)