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Whether you add a domain by using the Domain Quickstart Wizard, standard method, or without changing DNS services, you will follow the same general procedure:
Identify your DNS provider.
You will need to know who your DNS provider is and how to log on to the DNS administration console for your domain. Locate this information before you begin. If you do not know who your provider is, try browsing to http://www.internic.net/whois.html. Enter your custom domain name on the page, and then click Submit. In the resulting report, look for “Registrar” to see which registrar hosts your domain. You can use this information to track down your domain registrar and contact them, if necessary, about accessing your DNS settings. Additional assistance is available in the Office 365 portal Microsoft online help during the domain validation process.