When you say Air setting do you mean creating an Air App ?
If so when you select new flex project from the menu you have a choice to have an AIR app or a Flex app.
You can also change an existing Flex app to an AIR app but not the other way around. This is done by right clicking on the project in the package explorer panel and selecting change "project type".
no I dont mean creating an app. So I think that I found what I search.
in Dreamweaver has Setting for Air. e.g add icon