As a Mitingu user you get the choice to use our domain with your own subdomain attached to it or have a custom domain that is unique to you.
If you choose to use your own, please make sure that you have chosen and registered the domain name with your provider (Go Daddy, Namecheap etc).
Here's how it works.
Once you've clicked Settings, just click the Domain option in the left hand menu and you'll arrive at the Domain editing page.
Follow the options onscreen. If you need help with any of the domain pointing, then raise a support ticket letting us know who your provider is and we can point you in the right direction.