Hello, brief reply.
1, you can query on the mobile phone WIFI. Open mobile phone Settings -WLAN Settings - Connect to wireless network - Click network - display the two-dimensional code, open a code scanning software for scanning, the list shows PSK is the wireless password.
2, search on the computer. Take a network cable and plug one end of it into the computer NIC and one end into the WLAN interface of the router. Open the browser on the computer, and then open 192.168.31.1 to enter the router management page, enter the administrator password - Wireless Settings -WPA\/WPA2-PSK