Check the box in the Property Manager for the Spline that says "Proportional". Now you can move it around to your heart's content. If you want to rotate it, fix a point on it, make a circle centered on that point that passes through another point on the spline. Now fix the spline. move the second point to rotate around the first point. When you have it located the way you want you can delete the circle and unfix the first point.