@unknownuser said:
Then I manually put in two points via VCB.
As I mentioned previously, the plugin is not designed to accept two points via the VCB.
Perhaps these two videos would help you understand how the interactive versions are designed to work:
http://www.youtube.com/watch?v=M4QUO0PaI_E
http://www.youtube.com/watch?v=UX1HptFLObM