I was trying to configure NSX Edge Firewall Rule. As adobe flash has been deprectated, so flash based vsphere client no longer supports.

Open Postman

Click on Launchpad

User GET
https://10.65.252.134/api/4.0/edges/edge-5/firewall/config

Click on Send.

It will show all firewall related configuration.

Save this in notepad file.

Append according to required for new or existing firewall.

Open a new launchpad.
Use PUT
https://10.65.252.134/api/4.0/edges/edge-5/firewall/config

Select Body > Raw > XML
Paste content here, and click on Send