HP LaserJet 9000 Printer series - Manual (Page 26)

26 2 Finisher tasks ENWW
To select the stapler from the HP LaserJet 9000mfp
control panel
1 Touch Copy Settings.
2 At the Staple menu, touch Corner or Edge, depending on where
you want the documents stapled, and then touch OK. If you
selected Booklet from the Copies per Page menu, your stapling
options are None, One, Two, and Saddle Stitch.
Note The page icon on the right side of the touch screen shows the position
of the staple.