Engagement
To begin customizing your site go to Appearance -> Customizer and select Theme Options. Here's you'll find custom options to help build your site.
Reportage
To add a slider go to Theme Options -> Homepage and choose page slider. The slider will use the page title, excerpt and featured image for the slides.
After Day / Tarsh The Dress
To add featured content go to Theme Options -> Homepage (Featured) and turn the switch on then add the content you want for each section.