If your 655 is set up on wireless, then you need to go to the printer and set up the printers wireless to connect to the 655 routers wireless network.
If you don't have the 655 wireless setup, you need to log into the router and go to Setup/Wireless settings and set the WiFi mode to single mode G or Mixed G and N if you have any N devices. Give a SSID name of the wireless network, can be anything you want. Set the security to WPA or WPA2. Cipher type set to Auto. Enter in a Password that you only know and will remember. Once this is set up, then go the printer and follow it's instructions to connect to the routers wireless network, use the SSID and the PW you gave in the router. Call up HP if you need additional help with the printer if you need.