revert back to previous password

1Andre

I installed Bitdefender on my Dell laptop.

I did a scan for vulnerabilities and The app advised me to turn on the password.

We used the dell without a password but to get a known password I changed the password.

I logged off and on and used the new password and it does not except the password I have set.

I do not know how to disable the password so that I can access the Dell Laptop.

Please help?