@gameson
Respect what Tivosiv122 says but if your system is like mine it doesn’t show the Administrator Account as a separate user in the user accounts dialogue.
Easiest way is to restart your system if Safe mode (press F8 on startup then select Safe Mode). This then shows Administrator as one of the Users and on my system it either had my password as a default or it may not have even had a password, I can’t remember now. You can then change password as Tivosiv122 suggested.
I’m no expert so would appreciate it if someone else know’s how to get Administrator account showing up by default.