How to change the timing of the rigid body falling? I'm using blender 2.79b which is fantastic, I'm a student and I'm learning the software by myself and I had a problem about the timing of the body falling using rigid body.

How can I change the starting point for the object to fall.
You will find the Rigid body cache in the scene tab. That is where you can adjust which frame when the simulation starts. Use the bake button after you adjusted the values to recalculate the physics.