Open the web browser and enter the routers IP address 192.168.8.1
Login using the routers default username (admin) and password (admin).
Go to Settings > WLAN > WLAN Basic Settings to find the current SSID and WPA/WPA2 Pre-shared key.
Change the SSID to the desired Wi-Fi name and set the Pre-Shared key as the Wi-Fi password.
Apply the settings and wait for the router to restart.