I have a DIR-655 running Firmware Version 1.21. I am trying to change the "ROUTER SETTINGS" in the "NETWORK SETTINGS" section to correspond to my LAN's router requirements. I want to set up not only the Router IP Address and Subnet Mask but also the Default Gateway and the Primary and Secondary DNS. When I initially click on "NETWORK SETTINGS," for a split second, I can see a box for "Default Gateway," "Primary DNS Server," and "Secondary DNS Server," and then those boxes disappear. Is there a setting somewhere that will allow these boxes to not only remain displayed but will also allow changes? Thank you.