First, you need to install Motion LIVE 2D and the Face3D profile.

After installing the Face3D Profile, you will see the Face3D Tracker icon on your desktop.

Follow the below steps to start the program:
1) Open Cartoon Animator 4
2) Open the Face3D Tracker
3) Open Motion LIVE 2D in Cartoon Animator 4

Then refer to the below instructions to start your first facial capture project:
http://manual.reallusion.com/Motion_LIVE_2D_Plugin/Resources/CTA_4/Plugins/Motion_Live_2D/Workflow_for_Motion_Live_Face.htm