You can change your cPanel password from the 'Hosting' -- 'My Hosting' area of your user account.
- Please log in to your user account
- Go to 'Hosting' -- 'My Hosting' from your dashboard menu
- Click the domain name in question to bring up the 'Hosting Details' screen for that domain
- Tick the 'Change Password' box
- Enter and confirm the new password and click 'Save Changes' to finalize the change