You can manage your domains by logging into your account at http://hostingpen.com/login.html
After you have logged in you can manage all of your registered domains by clicking on the "Domains" link along the top navigation and then select: "My Domains".
This page will list your Domains. To the right of each domain will be a Manage Button. Click on the Manage Button for the domain you wish to manage.
You will then find the details of this domain and various Links to manage the domain along the Top.