...
Take out the battery from the beacon you would like to add,
open the https://portal.twinzo.eu/#rtls/beacons page,
or paper for the beacon MAC address
open your app for scanning Bluetooth devices and start scanning,
insert the battery into the beacon,
after a while, the beacon with the name INFOTECH or twinzo tBeacon CR should pop up with its own MAC address,
take note of the MAC address.
...