There are two ways to connect to a WiFi network with your Android smartphone -
#1 Android Settings
Swipe down on your notifications on your Android smartphone to locate your WiFi connection. You can also open it by clicking on Settings > Network > WiFi  Scroll to the bottom of the section  Click on the QR Code that is adjacent to the Add Network option  Now, scan the WiFi QR Code to join the network
#2 Camera
Open your camera app on your Android smartphone Locate the QR Code and position the camera on the QR Code to scan the WiFi QR Code  Tap on the notification banner to join the network