Kyocera FS FS-3900DN Operation Manual page 39

OPERATION GUIDE
2 Push lock lever to the right and pull out the toner container.
3
Put the old toner container in the plastic bag (contained in the toner kit) and
discard it later according to the local code or regulations for waste disposal.
4 Take the new toner container out of the toner kit.
5 Shake the new toner container at least 10 times as shown in the figure in
order to distribute the toner evenly inside the container.
6 Remove the label from the toner container.
Maintenance
Lock Lever
Plastic Bag
3-5