How do I reset the administrator password?

Ap134GH wrote:

I have a new update, MacOS Catalina, that requires an administrator password. How do I get a password?

So you do not have your Mac’s administrative password? Is that because this was a new-to-you Mac with macOS already installed and configured, or because the password has been forgotten?

If the former, follow the steps above to back up your files, and wipe and reinstall your Mac. This will cause macOS to be i stalled and associated with your Apple ID.

If the latter, open System Preferences > Users & Groups, and look at the list in the left column. iIs your user listed as an Admin, or is there a different login listed as Admin. If your user is listed as Admin, use your login password. If your user is not listed as Admin, use that Admin user’s password.

If you have forgotten the Admin password, use the Reset Password Assistant described here:

Change or reset the password of a macOS user account - Apple Support

If this is a new-to-you Mac, I strongly encourage backup, wipe, and re-install, as otherwise this and other updates will be associated with the previous owner’s Apple ID, and the previous owner may (or will) retain the ability to remotely reset this Mac.

Also, how do I remove the update from my computer?

By installing it, best.