RAK7258 can't found Device EUI

I need to create a application and then define a topics, but i can’t found the device EUI on RAK7258 do you know how to found it.

Device EUI is a property of each node, not the of the gateway.

If you actually need the Gateway EUI to setup the server (but please be sure your really need the gateway EUI not the Device EUI in that place!) you can find the full value derived from the MAC address sticker on the bottom shown in the GUI