Open door H, and then pull out the booklet maker.
Remove the staple cartridge.
Unpack the new staple cartridge.
Insert the new staple cartridge until it clicks into place.
Push the booklet maker back into place, and then close the door.
Remove the loose staples that are stuck in the booklet finisher to continue stapling and printing.
Replace the empty staple cartridge to continue automatic stapling of your documents.