I'm assuming you mean how to skip the Login/Registration page where the user create a username and password for their account. If so, that's not in the Facebook Application at all. That setting is in the JFBConnect configuration, in the User Options. Set the "User Creation" setting to "Facebook User Only".
Generally, for JFBConnect, the Facebook application doesn't ever need to be configured differently. Once it's setup and working, the rest should be able to be configured through JFBConnect.
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