We have had a few people trying to use our Beacon Demonstrator app to try to set up their beacon. Unfortunately, that isn’t the purpose of this app.
As mentioned in our article iOS and Android Apps there are two kinds of app. The first, supplied by the Beacon manufacturer, is to allow the beacon parameters to be set up. In most cases these apps are just setting Bluetooth Service Characteristic values via an easy-to-use user interface. The second type of app is one that end users use to interact based on the presence of beacons. Beacon Demonstrator is the second type of app.
Please see the documentation we supplied with your beacon(s) to determine how to download the manufacturer’s configuration app.