1 Choose a wireless gateway for your network.
2 Purchase a network adapter for the wireless network and computer you are adding.
3 Choose a good location for the wireless access point. This will affect how good the signal is in your house.
4 Install and configure the gateway.
5 Install and configure the network adapter card into your computer.
There are 3 other computers already operating successfully with the present wireless network and I don't want to disturb them. I just want to add another computer which has a built-in wireless adapter.