First connect camera to computer using the USB this allows the needed drivers to be installed,then look in control panel at devices,if the camera is now found great if not try adding a new device. Camera has to be in your devices to use the 70Ds Wi-Fi. Then in cameras Wi-Fi program give the camera a nick name.
Now the real fun starts getting the camera to connect with the computer. Using my Canon G16 the Wi-Fi was very simple,but so far getting my camera connected to computer has not happened. IMHO Canon has not done a good job with the 70Ds Wi-Fi software.