Watch this video for a step by step process on how to Change Your Email Password in Webmail
Webmail is the easiest way to change the password for users without cPanel access.
1. Log into Webmail.
2. Perform this step if you have changed your default Webmail page.
3. Select cPanel Webmail Home at the top from Horde.
4. Select Webmail Home on the left from Roundcube.
5. From the upper-right corner of your default Webmail page, click on your email account, then click on Password & Security.
6. In the Password & Security window type a new password, confirm the password and save the changes by clicking on the Save button.