guys help me urgently

So I was here in my house until I decided to change the password because a lot of people knew then I started watching a movie and after an hour or so I did not remember the password and after several attempts I could not remember he sent me connect to itunes but since restarted it I can not because I have to have a password on it after Reboot anyone know what I have to do?

sorry for the mistakes I used translator because I do not speak English very well