Redirection of electrical current
It would be more correct to say:

"How can I change the path of the current from flowing from point A to point C to flowing from point A to point B."

You would need to move the purple wire connected to the meter from point C to point B.

For current to flow, you need a closed completed path.  You can trace the path with your finger by starting at the battery's positive terminal, moving toward the meter, going through the meter, moving toward the graphite trace, moving through the graphite trace then moving back to the battery.