Canon EOS 750D Instruction Manual page 21

The nickname can be changed later from the [General sett.] screen (p.138).
Enter a nickname.
3
For instructions on entering
characters, see "Virtual Keyboard
Operation" on the next page.
Enter any characters between 1 to 14
characters in length.
Exit the setting.
4
When you are finished, press the
<M> button.
Select [OK] on the confirmation
dialog and press <0> to return to
the menu screen.
Registering a Nickname
21