Reformatted drive
My iMac (2017) wouldn't progress all the way through startup. I took it to the local computer shop and he got it to start up, so he made backup of the drive and installed Ventura. When I got it home, the drive was clean and the backup was in a folder on the desktop. It's logged in to the user name "Apple." I logged out of "Apple" to log in to my own user account, but then it wanted the "Apple" password, which of course I don't know. When I restarted, it was logged back into "Apple." Before I do anything else I'd like some guidance because this situation is new to me. How do I set the machine's admin password? How do I get rid of the "Apple" user? How do I recreate the user login I had before? Many thanks.
iMac