Lay the syringe and the Caverject vial into the plastic case and pull the red plastic piece off the case.
Shut the case's lid and press the bottom and top of the lid together until it snaps. The snapping noise is an indication that the case is properly closed.
Insert the red plastic piece into the hole located on top of the case. Push the plastic piece into the hole until it snaps down into the case to lock the case. The red plastic piece acts as a safety lock to ensure the case cannot be reopened.
Dispose of the case in the trash.