Canon EOS-1D X Mark III Advanced User's Manual page 588

8.
Select [New settings].
Select [OK].
For [Configure online], go to step 9.
For [Configure offline], go to step 2 in
Function
By selecting [Select from list] when communication function settings
are already registered on the camera, you can apply the registered
settings.
9.
Use the other device to connect to the camera.
(1) SSID (network name)
(2) Encryption key (password)
Settings.
588
Configuring Communication