Adding a picture to a question or answer is very easy , Just follow the steps.

 1. Clicking the Insert Image button on the toolbar.
[![Add Image][1]][1]
 2. Then a popup should come , from that popup select an image from your computer, or the web.
[![Add Picture popup][2]][2]
 3. and Click on add picture.
[![Added picture][3]][3]

 4. Then something like this will be generated in the text area
`[![Image Description][1]][1]` , now you can add/edit your image's
    description.

**More Reference**

 1.go through this [Meta][4] post.


2.An animated image showing how to edit and add an image to a post.
[![Animated.][5]][5]


  [1]: https://i.sstatic.net/IcuSf.png
  [2]: https://i.sstatic.net/ItnrS.png
  [3]: https://i.sstatic.net/2wXUK.png
  [4]: http://meta.stackexchange.com/a/75498
  [5]: https://i.sstatic.net/wnjGU.gif