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To activate Photo Stream on each of your iOS devices, tap Settings > Photos & Camera (or Settings > iCloud > Photo Stream) and make sure Photo Stream is set to On. To share your Photo Streams and view others’ Shared Photo Streams, also make sure Shared Photo Streams is set to On.
That’s it—no further configuration is required or possible. Having done that:
From now on, photos you take on your iOS device (or that you add to your Camera Roll in another way, such as by taking screenshots) are uploaded to your Photo Stream automatically.
Your iOS device will automatically download photos added to your Photo Stream by your Mac, your PC, or another iOS device you own.