Each wireless printer has a configuration that needs to find and setup for
your wireless router. Typically, you first WIRE the printer directly to the router,
setup the config on the printer, and then disconnect it and go wireless.
If you have any other wireless device(s), then this is very similar to what you've
already done before.
You will need the wireless settings from your router, eg:
the SSID and the encryption type (WEP,WPA,WPA-2) and the encryption key itself.