Add the ESXi hosts to vCenter:
- Open a web browser and go to the vSphere Web Client at https://<vCenter Server Appliance FQDN or IP>/vsphere-client.
- Log in with an account that has administrator privileges.
- On the Home page, go to Hosts and Clusters.
- Right-click the datacenter object, and then select Add host.
- Enter the appropriate DNS name or IP address for the first compute host.
- Complete the remainder of the Add Host wizard.
- Repeat steps 3 through 6 for each host.