Is this your first time here?
To access Moodle, use your school-assigned e-mail address. If your e-mail address does not work, try your previously-assigned Moodle username (your account may not yet be updated with your school-assigned e-mail address).
If you cannot login, use the "Forgotten username or password" link above and search by e-mail address only.
Changing your password in other systems (e-mail or student information system) does not change it in Moodle.