You have to create one to four pages for slider. Page title works as slider title, page description works as slider description, slider url(from Customizer) works as hyperlink of image/title/button, feature image acts as slider image.
Navigate to the path: Customize->Site header panel->Header Media Section->Select page for slider. And select pages from drop-down. And enter the url for a specific slide to redirect to another site or page. You can leave it(url field) blank as well.
You can add slider button by entering text on “Header Media Button Text” field. After then you have to check ” Enable Button” checkbox.