Slide show, header background colour and submenu's inline

Hello,

We have installed your WP-theme installed ([Airi – Just another aThemes Demo Sites site).We have some problems with the theme, see the questions below. Can you help in some way with solving does problems?

We want to change the background colour of the header; how can we do that?
We made some submenus’s but although in Menustructuur they are all submenu they are not inline; how to solve?

Is it possible to insert a slideshow in the header and on the pages?

Thx in advance.

Ben Rog Netherlands