Setting up the integriy.st OpenVPN on NetworkManager is easier than
the official docs describe. Instead of manually entering all the data,
you can use the client.ovpn file included in the .zip
downloaded.
When creating the OpenVPN connection, select “Import a saved OpenVPN configuration …”.
Then select the client.ovpn file. You probably want a better
connection name than “client” so make one up and fill it in. Enter
your username and password, save and connect.
Done.