Thank you mase and narcisgarcia. The solution was to edit cupsd.conf as mase had stated earlier:

After that, adding the printer was successful.

I was then able to print a test page to a network printer from the cups http:\\localhost:631\ interface.

Unfortunately, when attempting to print from Firefox, the list of available printers put up by Firefox still comes up with no printers in it, even after setting the single printer as the default.

You can access this printing screen in Firefox by pulling up a map in Mapquest and clicking "Print this Map" on the page.

This may be a Firefox issue of not accessing available printers via CUPS.