I want to setup a network printer and I have the ppd file for it. How can I point to my ppd file in setup process? I tried cups web interface at localhost:631 but I got "Connection refused" answer. I inspected the config, but the "Listen localhost:631" line was not commented so I don't know where can I enable it.
elementary OS doesn't have an option like Ubuntu of loading directly from PPD. I would recommend instead downloading the driver directly from the manufacturer's website with their install script and following elementary's prompts.
If you would like to configure additional administrative features, run
system-config-printer in your Terminal. Alternatively, you could try a CUPS web install or, if you are a glutton for punishment, CUPS install by text.