Turn on the Mac, and press and hold command R immediately after you see the Apple logo. The Mac should start from the macOS recovery partition.
You will be asked to select a user you know the password for, select the user, then click Next, then enter the password for that user (must be an administrator).
When the macOS utilities window appears, choose Utilities, then Startup Security Utility from the menu bar.
When asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.
Change the security level you want (don't reduce security unless you really need to).
I usually write a blog post about once a week. The latest post can be viewed here: Avoid Microsoft: If you don't really like computers much you could make things a bit better for yourself. (posted 2024-12-04 at 12:05:50). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-08-22 Stirring Up Trouble: Let's just get every view out there and fairly debate them..
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