Menu: Edit / Classifier
In this menu you will be able to activate the "Classifier" by clicking 
. You can drag the classifier around with your mouse, it will move on the plan dictated by the view. You can choose between a "Cubic" or "Spherical" shape, and then decide on the "Size".
The "Size" will be the radius of "Spherical" and the length for "Cubic".
From the drop box, select the class in which you would like to send the points. Then press"C" to classify.
