If the user select this stack on the creation of device, there are also other input fields for this protocol: LoRa device profile and LoRa details.
Device profile defines the device capabilities and boot parameters that are needed by the network-server for setting the LoRaWAN radio access service. DeMa presents a list of default values , if your device doesn't match with this list, you can ask to extend it.
Third input field is for Device details, where user can insert device EUI
After this user can continue with creation of his device as described in device registration