After login goes to the editor area then at the top right corner there is a drop-down option(See the picture below), click on it, select change password option. After that enter your email address, old password then new password and proceed.
Kindly remove AP- when you enter your old password e.g that is your old password(AP-09SA8FD7FDS87DF6). Use only this section as your old password.(09SA8FD7FDS87DF6).