HP Color LaserJet Enterprise Flow M776z All-In-One Laser Printer - Manual (Page 100)

3. Lift two tabs on the staple cartridge, and then lift
up to remove the empty staple cartridge from the
staple cartridge carriage assembly.
Do not discard the staple cartridge carriage. It must
be reused with the new staple cartridge.
4. Insert the new staple cartridge into the staple
cartridge carriage.
5. Reinstall the staple cartridge carriage into the
stapler by pressing the colored handle inward until
it snaps into place.
6. Close the inner finisher front door.
86 Chapter 3 Supplies, accessories, and parts ENWW