I have a Facebook app and would like to change the permissions on it. These were straightforward to set when I created the app, but when I login to the app and go through the settings, I can’t find any mention of permissions. Where do I go to update the permissions on an existing app?
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If you are user using another app: you cannot modify existing permissions. The best you can do is deauthorize the app.
If you are the owner of the app, and you want to ask for additional permissions: then you simply need to redirect your present users to the app authorization link requesting them to authorize the new permissions.
This assumes that you are referring to the API permissions. http://developers.facebook.com/docs/reference/api/permissions/