vpnfailsafe-git, step by step please

Hi,
I want to use this package, i install-it and don't understand how does it work ?
I use latest Xfce, iptables is enabled.
I already create a vpn connection with networkManager (loaded *.ovpn files, i can edit-it and change from tcp to udp and vice et versa)
No problem when i connect , checking with ''curl ifconfig.co'', return me vpn ip's.
I just want a kill-switch to prevent leaks if disconnected.
Do i have to modifiy iptables?
And one thing i want to know it's about terminal, when i want to access root user, it's better to use "su" or "su -"?.
Best Regards
Zender.IPFWRU

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