[bitfolk] Deploying OpenVPN on a VPS

Hi, I'm going on a foreign trip to somewhere the only network available will be firewalled and behind an HTTP proxy so I'm trying to set up a VPN on my VPS so I can get "proper" Internet. Don't worry about the permission-to-vpn-out; I've dealt with that. I used to have a bridged VPN set up at home that let me join my home network. That worked fine but since I don't own a subnet at Bitfolk I don't think I can use that configuration here. I've installed OpenVPN and set it up for a routed network. The client connects fine to the server on the VPS and gets a ten-dot address from it. I can ping the .1 address from the ten-dot range and the other interfaces on the VPS. I've got no connectivity to the outside world. My VPS has 2 IP addresses on eth0 and eth0:1. I think I need to NAT the eth0:1 address so it can be used by the client as an Internet connection. I've tried the advice from a couple of online guides but I can't get it to work. I may have to travel as early as tomorrow so I'm running out of time for random experimentation. Can anyone give me some pointers on how to make this setup functional please? Thanks, Paul.