How to do the new video chat on snapchat?

The yellow icon which is supposed to turn blue doesn't for neither me nor my friend, I'm using an iPhone 4 and she has a 4s.

Swipe to the right side while u in app
And thin keep clicking on the camera icon on the right and it will start recording
And to switch between the front and the rear camera while your holding your finger to the screen swipe up to the rear camera and down to the front one

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