See: http://www.limpens-advies.nl/

How can I move the menu-item bar form the right of the screen to the left below the logo?

look at the options at ato->Style & edit HEADER AREA->Configure Header Area

I forgot to mention, but I'm using the Flexibusiness Theme instead of the Atahualpa...

This forum is for users of the Atahualpa theme, I suggest you go contact the author of the theme you are using. Good Luck.

p.s. if you decide to switch to Atahualpa, we'll be happy to help you with questions about it.