Mark K is right, and I can elaborate.
In the air, no fixed wing airplane can reverse. On the ground, however, different techniques are used to reverse:
1. For light aircraft, the engine is stopped and a pilot outside pushes on the wing while a pilot inside controls the rudders based on verbal commands from the outside pilot.
2. For light aircraft, a single pilot can attach a tow bar to the nosewheel and push/steer the airplane backwards.
3. For heavy aircraft, the usual way to reverse is to coordinate a "tug" whose operator controls the aircraft's movement. This procedure is called a "pushback".
4. And again, some aircraft with thrust reverser of some sort can reverse on their own power. This procedure is called a "powerback".