New AX3000 setup

I recently bought a Wavlink AX3000 mesh system with three Cube Air devices. Setup was quite easy and I have good WiFi.

I installed the Wavlink App, but find it confusing. It says I have an unknown SSID and that I have to ‘bind a device’. I've no idea what this means or how to do it. I don't see anything in the little Wavlink user guide.

Is there a simple guide covering this?