[Theme: Classifieds Directory]

We have been searching for a way to edit the theme in order to show it like this:

http://www.guiabomdepreco.com.br/brasil/wp-content/uploads/2015/06/menu-superior.jpg

This is how the theme is right now:
http://www.guiabomdepreco.com.br/brasil/

Any advice on how we can custom the theme header in order to show it like the image above

Thanks in advance.