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Using the number buttons
Display the screen for inputting characters.
To change a character, use 
to align the cursor with the character that you want to change.
Press +10 to select the character type (upper case, lower case, or numeric characters).
Press 0 – 9, +10 until the desired character is displayed.
The types of characters that can be input are as shown below.
Repeat steps 2 and 3 to change the name then press ENTER to register it.