Ultimate FB Plugin on Multisite with Multiple Users

Hello, just installed plugin and it seems if I just setup one app on FB, all the posts that myt users want to submit to FB will show on my wall and not theirs. Am I not understanding how the plugin works?

Also if that’s true, I would like them to be able to configure the plugin so they can post to their walls. But when they login, they don’t have any option to do so because they are set as “authors” and not admins. Is there a way to modify this to allow them to configure and setup their own app unless I only need to set it up once?

their sites use sub-domains i.e.