I have a WebHost Manager account and I want to edit a dns zone so that if a user types in https://mydomain.com that it will automatically resolve to https://www.mydomain.com. I have been battling with my web hosting company for days and they don't seem to understand my question. I have a godaddy ssl certificate for www.mydomain.com and they said I can edit my dns zone to resolve https://mydomain.com to https://www.domain.com.

What you want to do is edit your DNS records. Go to the control panel of Godaddy and point the DNS records to the IP address that you have. This will resolve your problem. Now remember it takes up to 48 hours for all the servers in the world to get it. Call godaddy tech support again and ask them how to point your DNS records. Also if you have a email on the webserver make sure you point your MX records too so your email will work.