Canon EOS 750D Basic Instruction Manual page 176

Registering a Nickname
Before setting up a connection, set the camera's nickname (for
identification).
When the camera is connected to another device via a wireless LAN,
the nickname will be displayed on the device. Be sure to set a
nickname as otherwise you cannot go to the wireless LAN settings
screen.
W-14
Select [Wi-Fi/NFC].
1
Under the [51] tab, select [Wi-Fi/
NFC], then press <0>.
Select [Enable].
2
Press the <Z> key to select
[Enable], then press <0>.
When this setting is selected for the
first time, a screen to register a
nickname is displayed. Select [OK]
and proceed on to step 3.