Canon CLC5151 Reference Manual page 337

If you select [Watermark]
Press [Enter] enter the desired text
If you have registered characters in Register Characters for Page No./Watermark in
Common Settings (from the Additional Functions screen), you can select the characters
from the list.
NOTE
For instructions on entering characters, see "Entering Characters from the Touch Panel Display,"
on p. 2-27.
If you select [Date]:
Select the date format
If you select [Copy Set Numbering]:
Enter the starting number using
[Create]:
press [OK]
press [Next].
- (numeric keys)
Forced Secure Watermark Mode
[OK] [Next].
press [Next].
6
6-63