If you can access your GlowHost Account Manger located here:
http://glowhost.com/login/client.php then click on "Manage my Domains" and you will see an option to reset your cPanel and FTP password. Your username is also stored in your account manager for your convenience.

If that does not work for you, please submit a ticket to the "login problems" department at our helpdesk and we would be happy to assist.

The helpdesk is located here: http://glowhost.com/helpdesk