Ricoh Aficio 551 Copy Reference Manual page 209

To delete the User Stamp
Important
You cannot restore a deleted stamp.
A Press the [Delete] key.
B Press the stamp number (1 – 4) you want to delete.
Note
Only programs with m contain a user stamp.
C Press the [Delete] key.
Note
To cancel the deletion, press the [Stop] key.
D Press the [Exit] key.
E Press the [Exit] key.
G
Press the [Exit] key.
The initial display appears.
Stamp
2
193