Open the document to print.
Select [Print] on the [File] menu.
Select [Printer Features] in the pop-up menu.
Select [General 2] in [Feature Sets:].
The item names in [Feature Sets:] differ depending on the version of Mac OS X you are using.
Select the Z-fold type in the [Z-fold] pop-up menu.
Z-fold can be selected only on machines with the optional finisher and multi-folding unit attached.