Menu: Edit / Eraser
In this menu you will be able to activate the eraser by clicking 
. You can drag the eraser around with your mouse, it will move on the plan dictate by the view. You can choose between "Cubic" or "Spherical" shape, and then decide the "Size".
The "Size" will be the radius of "Spherical" and the lengh for "Cubic".
Press"D" to erase and "R" to restore
