Where do I begin to get the robot to move using the camera?

[pheadxdll]

Here's your problem you need to add a declaration of the function at the top of your user_routines_fast.c (or what ever file is running the camera code).

At the top below the includes add:

unsigned int Find_Distance;

and you should be fine. If that errors out just incase try this:

unsigned int Find_Distance(void);