Ricoh Aficio MP 161SPF - Manual (Page 108)

Fax Features
100
4
F
Select the bit number you want to change.
When the bit number is pressed, the current value switches between 1 and 0.
Repeat step
F to change another bit number for the same switch.
G
Press the {OK} key.
H
Repeat steps E and F to change the switch settings.
I
After all the settings are finished, press the {User Tools/Counter} key.
Reference
p.101 “Printing the Parameter Settings List”