Using a VPN with Comodo Firewall

Hey guys, I’m new here. Love the program Comodo Firewall.

I use a BTGuard VPN that I connect to using OpenVPN. I also use Comodo firewall.

How do I force a program to go through the VPN instead of my normal connection using the firewall?

For example purposes, I would like to use Mozilla Firefox to go through the VPN for anonymity and I would like Google Chrome to go through my regular ISP connection for faster speeds. How do I set this up within the firewall?

Thanks guys, I am really stumped.

EDIT= found it few posts down 88)

I would like to force block all non vpn connections,
I have seen a tutorial some where how to do this using comodo firewall but can’t find it anywhere now ???
help us out plzz