These days securing your Wifi is essential, apart from a strong password a popular method is to disable the Broadcasting of SSID (Service Set Identifier).
The steps below will guide you on how to connect a Windows 8 or Windows 8.1 computer to a hidden network.
On your Windows 8 or Windows 8.1 computer, click the Desktop tile that is pinned on the Start screen.
Click the wireless icon at the bottom right corner of your screen to allow the list of available wireless networks to show up then click hidden network wireless.
Click the connect button ( You can check Connect automatically if you want the computer to automatically connect to the hidden network each time it is within range.)
Enter the name of the network or SSID then click Next.
Enter the network security key or password then click Next. ( the password is case sensitive)
Wait for a few moments while the computer is trying to connect to the network.
Your computer is now successfully connected to the hidden network.