To change your password from Outlook Web Access OWA.
1. Navigate to Outlook Web Access server address which should look something like this https://mail.servername.com/owa
2. Log in using your email address i.e. firstname.lastname@example.org and your password.
3. Once logged in, click on Options
4. Then click on Change Your Password
5. Input your current password and your new password twice.
6. Click Save