If you do not have admin rights on this network, follow these steps:
Select "Nearby Devices" and locate your device.
To unpair the "Paired" device tap on it and select "Unpair device". The app will open an unpair screen. After tapping "Start" wait for the orange bar to appear and then turn OFF the power from your device. After few seconds turn ON the power for the device. This will unpair it from the network.