Theme Horse

Hi luizaugusto.mb,

Just follow these simple step to setup slider.
Create any poge / post from your dashboard. Identify the id of that page / post. At the top of Url section you see something like this yoursite.com/wp-admin/post.php?post=85&action=edit Can you see the numeric no 85? That is the page/ post id.

So then after goto dashbaord -> appearance -> customize -> featured post page slider -> featured post page slider options and add that page/ post id. View below screenshot.
http://awesomescreenshot.com/0a55kvnz91

Hope this may help you
Thank you!