Missing domain management options?

I'd like to manage my domains, which as far as I know are hosted with Comast.  However, I don't seem to have any options in the control panels that allow me to do that.  All of the Manage Domain options are only showing me the domains and the various subdomains setup to make the hosted Exchange function.

Am I missing something?

I'm trying to add a subdomain that points back to my static address, while leaving the mail settings untouched, but I don't see any way to do this.

Thank you