How could I add featured image to page header for single post like this: http://prntscr.com/jd2jla, also custom its height & width plus remove spacing between these part page header and content area & sidebar, comment area
1. For the Featured image inside the header, it means similar to this > http://prntscr.com/jdbim2 I tried used the custom field about thumb of featured image in your document but the size is small and can’t control