How did albert discover the atomic bomb?
Albert? seriously! your on a first name basis with the undisputed greatest mind of our time? Well anyways, Einstein didn't discover the atomic bomb. You can't discover a bomb. The bomb was created by J. Robert Oppenheimer. As for how, you have to be more specific, how did he come up with it? How did he plan out the building? Your question tells nothing.
Albert Einstein did not invent the Atomic Bomb. In 1915 Einstein worked out the equations which made it possible for people to create an Atomic Bomb. In 1938 Heisenberg figured out the engineering which made such a bomb possible. Einstein heard about Heisenberg's work on behalf of Hitler and sent a letter to President Roosevelt warning him about the dangerous nature of such a bomb.