Click on the profile icon on the top-right of the Dashboard page and select Profile Management
https://lh5.googleusercontent.com/6kwnZ6f1sMayTcVN7iinA_LyMVuIu7qxigBtO_udlnUQhMaLt7SdpZmzPBnhqUhCvbdnw9xjkneMJJ5t_nPXLQhmgKKwYhKFH-HN4JPPgYsGzDXD4_ms1PLWT1T_IFcgiqo9FbnFifzSf3UDvA
Click the Change Password button then enter your current & new passwords.
To change the email that your account is registered to, update the address in the Email field.