You create a link to the main External javascript file in the <head> section of your page.
1 - Select View > Head Content. This opens the head content section of your page so you can see any Head scripts that are installed.
2 - Click anywhere inside the Head section then select Common > Script.
That’s it. Your actionscafé Behavior is now ready to run.
Behaviors might also contain other helper script files that can be linked in the same simple way.
Your documentation will tell you what files must be linked and which ones are optional.