Anyone can solve my problem about my messenger account? I change password to my account but the problem is I can log in my account with my old and new password. Is that possible?
It's obviously possible since you're doing it, but it shouldn't happen. Leave it an hour or so on the basis that there is some problem at Yahoo's end then try again.
It's not possible but I am surprised how it is happening with you, I think you should go again into password change section and should change your password again, then w8 for some time before login again. May your problem be solved with this effort.
To correct this problem, first you need to change your password again,may be it was not changed last time you changed it. if still getting same problem. You can contact their customer service via email.