Canon EOS-1 DX Mark III Advanced User's Manual page 576

Setting the access point authentication method
3.
Select the authentication method.
Entering the access point encryption key
Enter the encryption key (password) set on the access point. For details on the
password that has been set, refer to the access point's user manual.
The screens displayed in steps 4–5 vary depending on the authentication and
encryption set on the access point.
Go to Setting the IP Address
screens shown for steps 4–5.
4.
Select a key index.
Select an option and then [OK] to go to the next screen.
On the [Encryption settings] screen displayed if [Open system] is
selected, select [Disable] or [WEP].
if the [IP address set.] screen is displayed instead of the
The [Key index] screen is displayed if you have selected [Shared Key]
or [WEP] in step 3.
Select the key index number set on the access point.
Select [OK].
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