The following is a step by step guide for adding a VMware ESXi 6.0 host to a VMware vCenter Server 6.0 datacenter.

1. On the home screen of the VMware vSphere Web Client select Hosts and Clusters.
2. Select the datacenter object, right click it then select Add Host….
3. On the Name and location section enter the hostname or Internet Protocol (IP) address of the VMware ESXi 6.0 host then click Next.
4. On the Connection Settings section enter the authentication credentials for the root user account then click Next.
5. On the Security Alert dialog box click Yes.
6. On the Host Summary section review the information for the VMware ESXi 6.0 host and click Next.
7. On the Assign license section enter license information or select the Evaluation License and click Next.
8. On the Lockdown mode section accept the default setting of Disabled and click Next.
9. On the VM location section accept the default setting of the datacenter object and click Next.
10. On the Ready to complete section review the configuration settings and click Finish.
11. In the VMware vSphere Web Client verify that a recent task completed adding the VMware ESXi 6.0 host to the datacenter.
12. In the VMware vSphere Web Client verify that the VMware ESXi 6.0 host is located under the datacenter object.