Hello, I have a Mac Mini G4 that didn't come with built in wireless. It's always been hard wired. Now I need it to be wireless, but where can I get the software that will allow me to search for available wireless networks like if I had to plug in a usb adapter and search? The little pie piece that sits on top right of my screen how do I get that. I have it on all my other macs but those have wireless built in.