Phantom account on boot screen and wrong password message

Shortly after I got my new Lenovo laptop, I was doing some ill-informed poking around trying to eliminate the need to enter my email account and password to log in. What I wanted was to go straight to the desktop on boot. I didn't succeed at that, but did eventually get my user account (the only one on the computer) to ask for a PIN, which is OK by me.

But..

Somehow, it still boots into wanting email and password, and immediately gives me a message that the wrong password was entered, even though I didn't enter anything. At the left of the login screen, it shows two accounts with my name. If I select the one I actually use, it then goes to the PIN input. But that's an extra step and a PITA.

How do I get rid of the "wrong password" message, which I assume will mean getting rid of the phantom account?

Or bypass the whole mess and boot straight to the desktop, which was my original intent?