Let me guess: You forgot your OS X login password. Dont panic! There are four different ways to regain access so one is bound to work for you. Each of the techniques covered are quick and easy, and wont keep your waiting. Check them out below. Use Users & Groups In System Preferences The main (and most obvious) method of resetting your OS X account password is to use the Change Password option in System Preferences. While this is the easiest option, youll need an administrator password.