Hi you should just download the OpenVPN Manager addon for Kodi. From here you can setup and monitor your VPN connection. You can also manage the connection and add exceptions.
I tried this originally but there is an authentication error, my password and username are 100% correct. I even changed the pw from having special characters to not include them (as suggested by nord vpn support) but it did not help.
Then you are doing something wrong.
I have installed OpenVPN addon on my Odroid-N2, configured it with my login and password and it works. Using Key Map Editor addon I have assigned TV remote’s button to show on the screen current network connection status.