Sign in to your Google Apps Control Panel
Once you've created an administrator account for your domain, you can reach your administrator control panel to activate services and adjust other settings.
The control panel URL for all administrators is:
https://www.google.com/a/your_domain.com (Replace your_domain.com with your actual domain name)
If you're unable to log in to your control panel, visit the I can't access my control panel troubleshooter.
To sign in to the administrator control panel:
Navigate to the Google administrator control panel.
The URL is https://www.google.com/a/cpanel/primary-domain-name, where primary-domain-name is the domain name you used to sign up with Google.
If the name of your domain already appears below the Username box, don't enter the@your_domain portion of your email address.
Enter the password for the adminstrator account
If you are an administrator and already signed in to Gmail, you can also reach the control panel by selecting Manage this domain from the gear icon at the top of any Gmail page.