Hey there maripgrc,
I apologize about the late response on this thread, thank you for being patient! Were you able to find your MAC address? If not, I'd be happy to help out, since I know playing around the Chromecast settings can be a bit overwhelming. I would check out this article on locating your MAC address to see if that helps you out. If it helps, you can also look up the IP address of your device on the Google Home app if you tap on the device, and access the settings.
I hope that helps you out, and if you have any other questions or concerns for me, please let me know!
We haven't heard back from maripgrc, and it's been a few days, so I'm locking the thread. As always, feel free to make a new thread if you have any more questions or concerns.
Have a good one!