You adjust the sliders to the maximum that you want those morphs applied, then you hit the create button. You should see the figure change to anything from slightly to a lot. Then if you adjust the Pose Level slider at the bottom, you can increase/decrease the effect of the character, which you should see in real time. Adjusting the individual body part sliders does not give you real time feedback, you have to hit the create button to see the change, and then play with the pose level slider to see a realtime increase/decrease of the effect. That's how it works on my Pro-Pack anyway.