• Log in to customer portal at https://www.virtbiz.com/client
• proceed to "My Domains". There you will be presented with the list of domains you have registered with us.
• click on the desired domain in order to edit the various parameters of the domain.
• The menu on the left has an option for "DNS Management". Click on that and you'll see all of the DNS entries and can make edits, add new entries, etc.