Newton's third law states that in every action, there is a equal and opposite reaction.

When we jump, we exert a force on the ground and the resultant force upwards propels us up into the air. However, the Earth's gravitational force pulls us down onto the Earth. As there is an equal and opposite reaction, we are also pulling the Earth to ourselves.

That said, is it theoretically possible to steer the Earth if all humans jumped at the exact same time?