Angels have the Phone Box
You don't. You either connect with an ethernet cable or wifi-not both at the same time. When you set up a wireless connection on your router, you have to give it a name (SSID) to broadcast (or, even if it's hidden, it still needs an SSID) and this name is for the wireless network connection. The wireless network is handled separately than the wired network. The wireless network can be turned off, and the wired network will still function. The wireless network should have a password set, to prevent unauthorized access. The ethernet connection doesn't have that password setup, as you have to be physically present to "plug in".
Hope that helps.