http://spine-xxxx.local (or the device's IP address) in your browser. The device serves this same dashboard itself.
No devices yet. Flash a device, connect it to your Wi-Fi, then add it here using the address shown on its setup page.
Removing a device only clears it from this browser's list. The device itself keeps running and can be re-added any time with the same address.
Flash the firmware and connect it to Wi-Fi first — its setup page (or Serial Monitor) shows an address like spine-ab12.local or an IP such as 192.168.1.42.