how do you install a router to a wi fi enabled lap top?

Answer 1

The obvious way: plug it in via a wire

Or if it's a wireless router, the laptop should detect it automatically if it's already setup and ready to go.

Answer 2

wired or wireless router? a wi-fi is usually a wireless router. if setting up a wi-fi then you will need 2 routers. which one of them must be wireless. to answer your question you dont, your laptop attaches to a wi-fi router via the wireless card in the laptop.