The process is really simple, it is developed for children, so it is really easy to use.
You or your children only have to select the picture they want to give a touch of colour and it will appear on screen surrounded by different colours. Then, the only thing you have to do is to select the colour and click on the area you want to give colour. Automatically it will have that colour.
It is fast, funny and really easy. Show it to your children you will realise how they get used to the computer in a few minutes.
You will find more pictures in the official site.