To Add or Delete Points on a Spline
1. Double-click the spline. The Spline tab opens.
2. To add a point, right-click the spline at the desired location and choose Add Point from the shortcut menu. The point is added.
3. To remove a point, right-click the point on the spline and choose Delete Point from the shortcut menu. The point is removed.
4. Click 
to exit the tool.
to exit the tool.