Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 889)

3.
Enter letters and numbers of your choice.
Enter four characters for User setting 1 or three for User setting 2.
By selecting [ ], you can change the input mode.
To delete single characters, select [ ] or press the < > button.
Use the < > dial or < > to select a character, then press the
< > button to enter it.
4.
Exit the setting.
Press the < > button, then press [ OK ].
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