...
Open your Adobe PDF file.
Click Print from the File menu.
Select a printer with stapling capability.
Click Printer from the lower lefthand corner of the window (this function may be found in a different location depending on your OS and print driver version).
If this popup appears, click Yes.
Click Printer Options.
From the dropdown menu, click Printer Features (You may have to scroll down to find Printer Features).
A popup window will appear. Set the following feature settings:
Finishing: Stapling
Stapling: 1,2, or 3 Staple
Staple Location: top left or multiple choice
Click OK.
The printing function has been enabled.
...