Ricoh Aficio 551 Copy Reference Manual page 207

To program the User Stamp
A Press the [Program] key.
B Press the stamp number (1 – 4) you want to program.
Note
Stamp numbers with m already have settings in them.
If the stamp number is already being used, the machine will ask you if
you wish to overwrite it — Press the [Yes] or [No] key.
C Enter the user stamp name with the letter keys on the display panel.
Note
You can register up to 8 characters.
To change the name entered, press the [Back Space], [Clear] or {Clear/
Stop} key and enter new letters.
D Press the [OK] key.
Stamp
2
191