"Not Found" Error with Domain Mapping Plugin

I'm using the Domain Mapping plugin and when I map the domain "fresnowebdesigncompany.com" to the subdomain "process.civicwebsite.com", I get the default homepage for my server. When I try to access "fresnowebdesigncompany.com/wp-admin" i get: "Not Found: The requested document was not found on this server."

Any help would be appreciated. Thank you.