If you need to substitute the configuration file of an already installed printer, you have to remove the old configuration file of this printer on you laptop. Please read the page: How to uninstall an old Sissa network printer configuration on your Mac (leopard)
a) On the menu located at the top of the window:
b) In the System Preferences window:
please look for Hardware section, then click on the Print & Fax icon.
c) In the Print & Fax window:
g)
j1)
j2) In the print queue window (for example SISSA IPP ps12) click on the Resume Printer icon.
j3) In the print queue window (for example SISSA IPP ps12):
k) In the Print & Fax window:
l) If you want to print a test page:
m) The window (for example SISSA IPP ps12) will appear… please ignore it… for the moment..
n) On the menu located at the top of the desktop window: