Sony MSW-900 Operation Manual page 214

To delete a character
Move the r mark over DEL, then push the MENU knob. The
character under the ? mark is deleted and the subsequent characters
move to the left one at a time.
To finish deleting the character
Move the r mark over RET, then push the MENU knob. The ? mark
on the character entry row changes to the r mark.
4
5
Repeat step 4 to enter remaining characters.
6
When you finish entering characters, turn the MENU knob to move
the r mark over END, then push the MENU knob.
The character setting mode is cleared and the SHOT ID page
appears.
To cancel entering or changing shot ID
Before performing step 6 operation, move the t mark to ESC at top
right of the window, then push the MENU knob.
Or, before performing step 6 operation, set the CANCEL/PRST /
ESCAPE switch to ESCAPE.
All changes or entered characters are discarded and the SHOT ID page
appears.
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Chapter 4 Adjustments and Settings for Recording