Carl, most routers have a tiny reset button, often on the back of the unit. While it has power, press and hold said reset button in for about 30 seconds. A "tool" like a paper clip is often small enough to press said reset button in. Once reset, it should show up on a computer as a basic / generic router in which you can enter the ID and password you choose. From what I see in the picture, you may have to remove the weather proof cover to gain access to the reset button. Here are some links to WiFi Ranger set up and Control Panel:
https://duckduckgo.com/?q=wifiranger+control+panel&t=chromentp&ia=web