Hi I'm new to using Routers and NordVPN

I want to use the Router for all my home devices.And have them all work through the router (VNP settings).

I tried to set it up unsuccessful. 

I have gone into the Advance - VPN Server-Open VPN settings.

I have checked enable VPN service.

Generated a certificate.

Exported the file.

Where do I input the Nord VNP settings

Shouldn't I  have to import the settings not export them?

Thanks in advance.