Canon EOS-1D X Mark III Advanced User's Manual page 585

Connecting with Manual connection
Network settings for camera access point mode are configured manually. Set [SSID],
[Channel setting], and [Encryption settings] on each screen displayed.
1.
Select [Manual connection].
2.
Enter the SSID (network name).
Select [OK].
Press < > to access the virtual keyboard (
After input, press <
Select [OK].
>.
585
), then enter the SSID.