how to change whatsapp background for one contact iphone?
['Press the home button and open WhatsApp.', 'Tap on the back arrow in the top-left corner if you are in a chat.', 'Tap on "Settings".', 'Tap on "Chats" in the settings menu at the top.', 'Tap on "Chat Wallpaper".', 'Tap on either "Wallpaper Library" or "Photos" to set wallpaper.']