customize the header

Hello,
I have purchased the Restaurant Wp Theme because I’m like it very much. I wish to customize the header, because I would like to put the logo in center position, over the menu navigation. I attach the image (and the link) of the theme is now. I attach also the image of the header that I wish.
link image
……….
link image: how I wish the header
I thank you for the support and I attend your answer on how can I to do, thanks!