If you signed up for a cloud hosting account, which mostly included Wordpress Cloud please refer to your welcome email. In this message sent to you automatically you may see all useful information such as server IP, nameservers, packages, add-ons, etc.
For customers willing to setup nameservers – our name servers are:
In case you are using your own custom nameserver, please find your IP address (in welcome email) and configure DNS entries on remote DNS correctly.
Usually it resolves simply by entering correct server IP address to A entry of your domain.
Contact our technical support for details.