One of the tips I learnt early on in photography, is that using your cameras small flash often causes a really bad effect on your photos. This is due to the basic rules of light which state that a small far away light source creates a “harsh” light and a large, close light source creates a beautiful soft light. While it is not an absolute rule that you should never use your built in flash (or pop up flash), it won’t help you to create beautiful soft portrait light.
However, in this video you’ll see an incredibly simple way to improve your light from a popup flash with a very simple and cheap piece of equipment.
Have a look: