You will have to install the drivers for your WiFi in order to enjoy this feature on your laptop. If you have the CD, insert it and start the setup package. Choose WiFi driver and continue with the installation until it's finished. Reboot the laptop and then you can connect to a WiFi network in your nearby area.
In case you don't have a CD with the drivers, turn the laptop upside down and note the model number. Paste it on Google, then visit the manufacturer's page to download the necessary drivers.