Open "Go to" in the Finder and then click on "Connect to server".
In the next window, paste the previously copied network address under "Server address" and then click on "Connect".
Then select "Registered user" and enter the Swisscom login you use for myCloud and your previously set password for WebDav (not your normal myCloud password).
Now the setup is complete, the WebDav connection to myCloud will now be under Shares.