To change your email account password you need to first login to your cPanel.
Once logged in, follow these steps:
In the Email section, click on Email Accounts.
Locate the email account for which you want to change the password, and click on the Manage button next to it.
Scroll down to the Security section and click on the Generate button next to the Password field.
A random password will be generated. If you want to use this password, you can copy it and save it in a safe place. Otherwise, you can delete the generated password and enter a new password of your choice.
Scroll to the bottom and click on the blue Update Email Settings button to save the new password.
That's it! Your email account password has now been changed.