The items view allows you to create in-game items. Just drag and drop the Item from the list into the graph to create a new in-game item.
As always, click on the preview area to open the detail view.
When a character performs an action on an item or a direction, let's say a "Look" action, the behavior tree of the same name in the item is executed. You can use this to send messages back to the user ("You see a burning torch"), ignite your torch using the Light node and execute more complex scripts if your item has state.
In the top left corner you have a permanent node which displays basic settings for the item: The default tile of the item and the item settings.