How to replace 'Featured Content' by my own photos and text

the text is saying: "Here you can showcase the x number of Featured Content. You can edit this Headline, Subheadline and Feaured Content from "Appearance -> Customize -> Featured Content Options". And 3 or 4 photos (Central Park - Antique Clock - Vespa Scooter etc. I don't know how to replace these photos and text by my own photos and text. Thanks for replying