Changing the mid position

Hi,
How can i change the mid position from figure 1 to figure 2? The tutorial in the phoenix hexapod is not clear for me.

Unscrew screw in center of servo horn, pull horn off. Rotate horn to desired angle and put back on servo spline. Reinstall screw. Note: rotating by one spline changes angle 15 degrees.

Kurt

I did it, thank you.
In the phoenix hexapod I should do this to all the servos, right?