Staple

Open the document to print.

Select [Print] on the [File] menu.

Select [Printer Features] in the pop-up menu.

Select [General 3] in [Feature Sets:].

The item names in [Feature Sets:] differ depending on the version of Mac OS X you are using.

Select the output tray to deliver the printed sheets in the [Destination:] pop-up menu.

Select the staple position in the [Staple:] pop-up menu.

Print the document using the print function in the document's native application.