Canon EOS R3 Advanced User's Manual page 674

Computer's screen (sample)
Smartphone's screen (sample)
Activate Wi-Fi on the other device, then select the SSID (network
name) shown on the camera screen.
For the password, enter the encryption key (password) shown on the
camera screen.
Once a connection is established, the settings screen for the
communication function is displayed.
Go to step 2 in Configuring Communication Function
674
Settings.