1. Prepare to edit L-line points (steps 1-4 described in Moving an Existing L-Line Point).
2. Position the cursor box over an existing point and click the left button on the mouse. If a point is found inside the cursor box it will be selected for editing. The point will be attached to the mouse (the point is captured) and will move where the mouse goes. Pressing the <DEL> key will remove the point.