What has happened with the management of my account?

When I go to the address mail.yahoo.com the program opens my account without showing the window where I could give my user name and password. In other words anyone using my computer can have access to my account.|||It is an option to have it open for 2 weeks. If you don't want to keep it open then sign out of mail. When you sign back in make sure the box isn't checked to keep it open.