fvs336 v3 and bt wan hub 4

Hi,

I have a BT hub4 going into an RDP server and the BT firewall doesnt do port translation so the port 3389 is constantly being attacked. On a different ISP i have a FVS336V3 firewall translating the port all set up and OK. My question is with another FVS336V3 unit, do I connect the red WAN port from the BT into WAN1 on the router, or how should I connect?

Any help pls as I have read a BT hub red WAN port is for BT modems only?

Would I have to get the username and password setup in the netgear box?

Thanks