Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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First, set the camera’s nickname (for identification).
When the camera is connected to another device wirelessly, the 
nickname will be displayed on the device. Be sure to set a nickname 
as otherwise you cannot set the wireless functions.
1
Select [Communication settings].
Press the <M> button, select 
[Communication settings] under the 
[54] tab, and press <0>.
2
Select [Built-in wireless settings].
3
Select [Nickname].
When this setting is selected for the 
first time, a screen to register a 
nickname is displayed. Press <0> 
and proceed to step 4.
Registering a Nickname