Ricoh Aficio ISC 615G - Manual (Page 266)

Registering Addresses and Users for Facsimile/Scanner Functions
258
7
E
Enter the registration number you want to protect using the number keys
or the Quick Dial keys, and then press the {OK} key.
You can automatically specify registration numbers 001-032 by pressing the
Quick Dial keys.
Press [Search] to search by name, destination list, registration number, user
code, fax number, or folder destination.
F
Press the {OK} key.
G
Press [Dest.].
H
Select [Auth. Protect] using {U} or {T}, and then press the {OK} key.
I
Select [Register as] using {U} or {T}, and then press the {OK} key.