How can I change my User name in my settings?
I need to change my username.
MacBook Air, macOS 13.5
Question marked as
Why do you want to?
If you have taken over a Mac that someone else used, create a new account, make it admin, and remove the other account.
Change the name of your macOS user account and home folder - Apple Support
If you decide to change the name, make absolutely sure you have a backup and you follow all of the steps exactly. The requirement to make the change from another admin account is absolutely necessary.