How to set background for a Steam profile? - Arqade

I noticed some of my friends can change their Steam background profile. I searched in "Edit Profile" tab to edit mine but I don't see how. Can someone explain how to do this ?

Steam Community :: Guide :: Best Steam Backgrounds Based On Colors

Steam: Animated Borders, Backgrounds and Profiles Explained

Favorite Steam profile backgrounds? : r/Steam

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steam artwork profile desing by LEITHON on DeviantArt

Comunidad Steam :: Guía :: ᴀɴɪᴍᴀᴛᴇᴅ ᴀʀᴛᴡᴏʀᴋs

Steam Community :: Guide :: Steam.Design - Create Background Showcases

Steam Community :: Guide :: Steam.Design - Create Background Showcases

How does Steam set a game's background in the Library? - Arqade

animated) Steam Artwork Profile - Andromeda by mahaka11 on DeviantArt

Does anyone know how to set the image for THIS view for non-Steam

SeeRjED's Steam Profile Designs on Behance

How does Steam set a game's background in the Library? - Arqade