Hello, sorry you are having problems,
OK, are you sure your printer supports duplex printing and if you are sure you have the right driver installed, this is how you print in duplex mode on a Mac.
Open the document you want to print,
Hit cmd+p to get the print dialogue window
you should see this:
Notice you have the option of two sided printing in the same line as # of copies.
If you do not have this option in 10.5.6, then you might have the wrong driver, N.B. you must be sure to select the proper driver when you are creating the printer in the Print and Fax preference.
Another way to ensure you have the driver properly installed, go to the manufacturer's website and download the Mac Driver Installer and run the installer, delete the printer you created and then re-create the printer again it should auto-recognize the printer..
What is the Printer Make and Model?
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