just unzipp and keep all in any place you want ;)
Just open the file helper.htm with your navigator
There is nothing to do with Moi it's just a video!!!

The white slot appear only when you draw an Helpers line!
For that you must Click move a point an release on one other point!
When you release this second point the White slot will appear
Then move you mouse or pen over it 2 seconds for see the menu