If you don't remember the WiFi password, you can always reset the router to factory settings. Make sure to change the WiFi password as well as the router admin password.
If you have another device already connected, you can get a QR code from that device that will have the WiFi configuration. Go to the connection settings on that device, select the settings gear next to the connected network, point your camera and connect. Or you can do as suggested and reset your router and recreate your network
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