1. Add new interface on your vCenter VM.
2. you can add new IPs on VAMI Console
https://vCenterFQDN-Name or IP:5480/
3. or via CMD too...
Connect vCenter via SSH & run below cmd and configure interface accordingly.
1. Moved to vCenter Server
2. No justification for you using that inflammatory language, so I've edited your original post
that's nonsense (its located where it is for ages.... in VAMI) and only applies for 6.7 and above
found it mysellf
fact is *it was* as described here, is now gone and there is no longer any interface
Edit the Firewall Settings of the vCenter Server Appliance