Hello.
I just installed Router OS on physical machine.
Im curently using the onboard lan card and i purchased the tp-link tg-3468 v4.0 pci express lan card for secondary.
When logging to winbox i only find 1 interface.
Any help for that?

What interface do you see? the one onboard or add-on card?

I suspect that chipset on your onboard ethernet requires additional drivers depending on OS installed and is not recognized by ROS...