My device came with an “App EUI” but I don’t see anywhere to enter that, what do I do?
Go into Applications–>Device–>Configuration and look for the Variable tab. Create a variable named app_eui and enter your appEUI there.
How can I use Tags?
You’re limited only by your imagination. One place to start is if you start to have a ton of Devices in the same Application, Tags can help you sort out their locations.