Step by step guideline

I’m a begginer with a basic knowledge of coding. I’m wondring if there is any step by step guideline how to configure the slides in the theme. The slides does not show up and I can’t fix the position in style.css.

How can I configure this to put it in the header of home page? Is there any suggestions for the exact code I should use to fix this (css and php)? This should help many users even the beginners.

Thanks