Not connected yet
On your PC, double-click Start Agent Builder. It shows a QR code — scan it with your camera and this app connects itself.
Copy the link under the QR code and paste it here - it carries the address and the key.
100.x.y.z:4000 address. Nothing is exposed to the internet.http://192.168.1.20:4000. Start the builder with HOST=0.0.0.0.Android or desktop Chrome: menu → Install app. iPhone: Share → Add to Home Screen. It then opens full screen, like any other app.