Topmenu: You need to put a menu to User3 module position.
Header pic:
YOu can replace it by your new image (templates/jf-fotosnap/images/header.jpg)
and then you need to edit your template css file (templates/jf-fotosnap/css/template.css)
You should change the height value of
- div.header (line 14)
- div.header-image (line 17)
to suit your need