are you talking about setting up a laptop in a wireless connection?
most new laptops do not require a network card, most have them built in.
you will need to look up the settings on your computer, you may have to buy a wireless network card.

most of the time, you can flick a little switch or just bring up your available connections and it bring up your wireless network. You should be able to connect to the network thru that, using My Networks or whatever your computer uses to display the network connections