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 ?

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

Steam Community :: Guide :: How to Identify Profile Backgrounds

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How to Get, Customize & Change Your Steam Profile Background

Steam Community :: Guide :: How to Identify Profile Backgrounds

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

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How do I completely remove a game demo from steam? - Arqade