NSX can only be managed using the vSphere web client. When NSX is configured with a vCenter, it installs a plugin for the web client. There is no management functionality available in the classic windows client.
Once logged in to your vSphere web client you will see a new icon called Networking & Security. You will see this on the left side navigation pane as well:
Now perform the following steps to generate a license:
- Click on the Networking & Security ...