If the sizing handle is green, point to the
sizing handles (the cursor will change to a cross-hair) and click the left mouse button.
The sizing handle should change to red to show that the point is selected.
If the sizing handle is green or red, point to the sizing handle (the cursor will change to a cross-hair), press and hold the Shift key down, press and hold the left mouse button down, drag the new point to the desired location and release the left mouse button.
If the sizing handle is not green or red, a point cannot be added.
To delete points
Select an item for editing.
If the sizing handle is green, point to the
sizing handles (the cursor will change to a cross-hair) and click the left mouse
button.
The sizing handle should change to red.
If the sizing handle is red, press the delete key to delete the point.
If the sizing handle is not red, the point cannot be deleted.