WRN1000v3 VPN Setup

Hi

I am trying to work out how to set up a VPN at roughter level to protect my entire network.

I have a WRN1000v3

I have purchaced accress to a VPN through https://www.privateinternetaccess.com

And just after some help in setting up, as I can't work out where it is done.

Please help !!!

thanks

Jonathan