Ricoh AFICIO MP 8000 Operating Instructions Manual page 371

Copying
A
Press [Edit / Stamp].
2
B
Press [Stamp].
C
Press [Page Numbering].
D
Select the format.
You can specify the stamp position, pages to be stamped, and numbering.
E
After you specify all desired settings, press [OK].
F
Press [OK].
G
Place the originals, and then press the {Start} key.
Reference
"Stamp", General Settings Guide
116