It's nice that you actually *read* the guys post before you dumped a useless reply on him. I see his post saying he runs Mac OS 9, and not Mac OS 10.3.3... You can go to the Apple Menu, go to the Chooser and see if it's listed under laserwriter8, if the printer has Appletalk enabled on the printer it might show up in there, if not you should be able to type in the printers IP address and find it that way. It will ask you to select a PPD file, a generic is good enough for most printers, adversely you may need to find a PPD file from the printers manufacturer, or find a PPD that accurately fits the description of the printer you're attempting to print to.
I hope this helps.