Thanks for your reply but if I select "header image" I am loosing the format (see attachment). If I delete "header image" option, the format is kept but the image is not appearing on heading.
We are sorry but we didn't get any attachment and to be honest, we are not sure what exactly you would like to do. To send us image, please use http://pasteboard.co/
We will try to explain it once again because looks like we are going to nowhere
All you need to do to create post page similar to http://themes.muffingroup.com/be/blogger2/14-2/ is to use Featured Image option on the right hand side and Header Image option under Post Options. Both options/fields are located under Post editing section. The one you presented on http://pasteboard.co/peP9AfVvK.png is an Intro Header type and we really do not understand why you set it up if we didn't told you anything above to set this header type. This header has completely nothing to what you are looking for.
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Comments
to set header background for individual posts, you need to use Header Image option under Post Options > Media section.
All you need to do to create post page similar to http://themes.muffingroup.com/be/blogger2/14-2/ is to use Featured Image option on the right hand side and Header Image option under Post Options. Both options/fields are located under Post editing section. The one you presented on http://pasteboard.co/peP9AfVvK.png is an Intro Header type and we really do not understand why you set it up if we didn't told you anything above to set this header type. This header has completely nothing to what you are looking for.