In order to change your email accounts password refer the following steps:
1. Login to cPanel
2. Find the option for 'EMAIL'
3. Click on 'Email Accounts'
4. Scroll down to the email account whose password you want to change
5. In the 'ACTIONS' column click 'Change Password'
6. Type in your new password - ensure that your password strength is >60/100
Click on 'Change Password'
Your password has now been changed successfully.