use the clear button to clear it, use the color button that is black to change the color, use the slider which is called, Pencil: Thickness 1 to change the erasor & pencil's thickness to 0/100, the erasor button changes the pencil to the erasor, the pencil button to change the erasor to pencil the color button that's not black is telling that you have this color chosen, ok that's it byeee!
