Which *.js file does the instantiate the Facebook module with require ()...Using Modules.Facebook

Using SDK 3.1.2 GA which *.js file do you create to instantiate the Module.Facebook?

I edited tiapp.xml <modules></modules> to include the android and iphone platforms. I'm working the appcelerator document, http://docs.appcelerator.com/titanium/latest/#!/api/Modules.Facebook.LoginButton

I searching for which *.js file to create or edit to instantiate this module. This is a where to how to question. Thanks in advance for your assistance.