The Raspberry Pi 3 and Raspberry Pi Zero W have built-in wifi, older Pis (and the normal Pi Zero) do not. Select your network, enter your wifi password, and click OK. In the top right of your screen, click on the network icon (two computers with an X). Our Magic Mirror needs to be wifi-enabled so that it can connect to the internet and so that we can access it remotely to set things up. You will now see the Raspberry Pi OS desktop (GUI). Connect your keyboard, mouse, HDMI cable and, lastly, the Pi’s power cable.
Unmount the SD card from your computer and insert it into your Pi. Get the new official Raspberry Pi OS on your Pi. How to Install Raspberry Pi OS on Your Raspberry Pi
