In the app, go to settings, remote. And, provided your computer and app are on the same network, you should see your computer 's Kiosc Editor 'advertised'.
Select it, and close the settings.
You should now have an interactive 'live' view of what you are building on your computer.
Once you are done setting up, save it on your iPhone by going to settings, File. Then the save button. Give the file a descriptive name, and you're good!
regards,