OpenVPN config server/client

Job ID: 33257739

Budget: €8 – €30 EUR

I have certificates and all stuff and connection working. I need configure routes.
I have 2 routers:
Main 192.168.1.1 (Internet Provider Router)
Secondary 192.168.3.1 (Neutral Router)
I need to be on the local network of Neutral Router when conected to VPNbut dont know how it should be.
Work is help me trough screen sharing to do this.
English or Spanish language