Aargh! Macintosh Hd doesn't want me to read and write to it.
I have Ventura Ver 13. I did the get info for my Macintosh Hd. It says "you can only read". I want to add myself as an admin to be able to read and write but it won't let me as I don't have the permission for that operation.
iMac 27″ 5K, macOS 13.7