View the CUPS "Getting Started Guide"
open the CUPS web interface on your computer http://127.0.0.1:631
Select Add printer
When you get to the page to select your printer See Figure 2
use the "Provide a PPD File" box to browse to eh ppd file you have for your printer.
Follow through the rest of the steps
No seriously the next piece you may have trouble with is the connection information.. How is your computer connected to this printer ? USB. Parallel port, Network ? if you need further assistance. please let us know.