When you show My Avatar Editor to children they recognise it straight away as it looks like the avatars (known as Mii) you can make on a Wii. It is very easy to use.
Type in your name and creator name.
Then click on the buttons below to personalise your avatar.
Once you have finished click on the the Save button (the first button)
There are several save options.
I recommend using the Export option as that allows you save it as a Jpeg. You can also select the Pictures size and a background colour.