For The User:
1. Login to Webmail.
2. Click on ‘Change Password’.
3. Set a New Password and confirm it.
4. Hit ‘Change Password’ to save changes.

That’s it, you’ve changed password successfully.
For the Admin:
1. Login to your cPanel.
2. Scroll to ‘Mail’ section.
3. Click on ‘Email accounts’.
4. On the center of the page you will see a list of the email accounts created.
5. Under Actions next to the email address,Click on ‘Change Password’.
6. Set a New Password and confirm it.
7. Hit ‘Change Password’ to save changes.

Voila, Your email password has changed.