ok, i figured you guys don't know what a "molinillo" is and how to use it.
you hold the molinillo with both hands extended, then you start moving one hand fordward and the other backwards, then the hand that went backwards goes fordward and the other the opposite.
That's how you make chocolate the traditional way.
In the lower right part of the pic there are 3 molinillos (the ones made of wood),