How do i unlock a mac book pro from the log in screen?

k so im on the screen wherever it such as “(name of your account)” as well as “password” nonetheless i dont not any the password.can another person tell me ways to get in for the computer with no wiping everything from it.

If everyone boot up from the OSX put in disc that sported the computer system, there is an option inside the top menubar that helps you reset that Admin password.