How to change the background colour of my whatsapp on my iphone?

I have a iphone 4, and my whatsapp has always had that white background on the chats, but I saw my friends and its black she told me she went into settings and changed it. I went into settings on whatsapp but couldn't find it do I went into the normal settings but couldn't find whatsapp?

Download latest version then you can do it.

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