You can create clusters from the Install and Support page.
At least two additional platforms are required. The additional platform VMs should be deployed and powered on.
To create cluster
Click Create Cluster for Platform VMs.
On the Create Cluster page, enter the following information:
IP Address/FQDN: Enter the IP address or FQDN of the new platform that you want to add.
Password: Enter the support user password of the platform VM. If you have not changed the password yet, then refer the Default Login Credentials section in vRealize Network Insight Installation Guide for the password.
To keep adding more platforms, click Add more and enter the IP address/FQDN and the support user password.
Click Submit. Click Yes.
After creating a cluster, the user needs to log in to the product again.