Oki 5700 - Manual (Page 34)

English
3-6 Chapter 3
7 Carefully peel the white plastic seal away from the bottom of the toner
cartridge. With the ridged side facing up and grey lever on the right,
insert the toner cartridge into the toner well left end first.
Caution:
Please be certain that the cartridge is not inserted backwards.
8 With the cartridge in place, push the grey lever forward to secure it and
release the toner.
9 Close the compartment latching the cover securely, return the upper
section of the machine to operating position, and reattach the document
stacker to the rear of the machine.
Attaching Document Stacker
Attach the document stacker at the document exit on the back of the
machine using the latching mechanism provided.