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Firstly you will need top open the camera app. From the Camera app you will notice 3 symbols on the top right hand side of the screen. The top of those 3 options allows you to switch from the front camera to main camera (and vice versa). The bottom of the 3 options opens up the camera menu. So instead of clicking on either of those two you need to select the middle option.
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Of course this feature was made with certain purposes in mind though I could imagine a number of other scenarios including for example, taking a photograph of yourself somewhere rather unique (i.e. the top of a mountain) or with someone special (for example a celebrity) though it can, of course be used for various humorous pictures if you've the creativity to think of things.