Important: Use a secure password. A secure password is not a dictionary word. It should contain a combination of uppercase and lowercase letters, numbers, and symbols.
For Shared hosting accounts:
To change your cPanel password simply login to your GlowHost Account Manager located here. Once logged in, click 'Manage My Domains' in the navigation bar. Once that page loads, you will see your control panel information and an option to change your cPanel password.
For Reseller, Dedicated and VPS accounts:
Please refer to the official cPanel and WHM documentation: cPanel - WHM official Documentation
You can do this for any user's cPanel under your account using the password change option on in WHM > Account Functions > Password Modification.