You can add a device using Wi-Fi credentials or WPS:
Add using Wi-Fi credentials:
Go to Devices and tap +
Select the Network you want the device to join
On the device you’re adding, enter the Network SSID and password to connect
Add using WPS:
Go to Devices and tap +
Select the Network, then tap Connect to enable WPS for 2 minutes
Press the WPS button on the device you’re adding
Add a Point of Sale device via WPS:
Go to Networks and open the Point of Sale network
Tap Connect Device via WPS to enable WPS
Press the WPS button on the POS device