This article shows you how to add a Windows 10 computer to the Wifi.
Step 1: Navigate to the Wireless network icon as shown by the red arrow below.
Step 2: Choose the network you wish to connect to and select "Connect", this information can be found on the back of your router should you not know it. See below.
Step 3: Enter your password and click "Next". See below.
Step 4: You are now connected. See below.