Ricoh Aficio MP 1600 - Page 256

Registering Addresses and Users for Facsimile/Scanner Functions
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F Press the {OK} key.
G Press [Details].
H Select [Auth. Protect] using {U} or {T}, and then press the {OK} key.
I Select [Destination Protect] using {U} or {T}, and then press the {OK} key.
J Enter a protection code using the number keys, and then press the {OK}
key.
K Select [Folder Protect] using {U} or {T}, and then press the {OK} key.