Canon EOS 80D Basic Instruction Manual page 257

Since the nickname is mandatory information, you cannot delete all the
characters.
By default, the camera name will be displayed for the nickname.
Enter a nickname.
3
For instructions on entering

characters, see the next page.
Enter any characters between 1 to 10

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
W-9