Header Banner Below the Posts

It sounds like you found the location to change the setting. Actually what you were seeing was not the “header” but the “Like Box/Page Plugin”. For anyone else who might experience this same issue the location within the plugin’s settings to change this can be found by going to your…

WordPress Dashboard – Facebook Feed – Customize – Misc (tabbed page) – scroll down to the Like Box/Page Plugin section and under the setting labeled “Position” change it from “Top” to “Bottom” or vice versa depending upon your preferences.