theme sliders and drop down list

Hi: I am using this template: https://themeforest.net/item/infocus-powerful-professional-wordpress-theme/85486
It has a drop down list and a 3 picture slider for homepage. How do I put pictures in the slider and how do I put pages in the drop down list in addition to having navigation across the top.
I know this is a lot; but I am stuck.

Thanks so much