Lexmark CS820
Turn off the printer.
Open door A.
Remove the paper bail.
Remove the standard bin insert.
Unpack the staple finisher, and then remove the packing material.
Insert the staple finisher until it clicks into place.
Insert the staple finisher cover.
Close door A.
Turn on the printer.
Continue to enjoy automatic stapling of documents as you print. Change the staple cartridge when you are prompted to.
Learn how to change the staple cartridge holder correctly. Here is a step-by-step guide.