What have you tried?
You are going to get nowhere quick with the 6.1 utility in Mountain Lion if this is the only OS you have available.
Look up how to install 5.6 utility under ML. At least then you can see printers. That is assuming you are trying to use USB.
Has this worked ever on Mountain Lion? Did you download the drivers for that printer for ML?
Plug it into a computer directly.. does it work? If it doesn't work locally it sure will not work via the network.