Welcome. Listen to the following steps.
1.Load Mine craft PE
2.Go to a world.
3.Keep hitting the back arrow until you leave the game.
4.Open minecraft pe again and go to the world you entered the 1st time
5.Place 2 blocks NOTICE: Make sure that you only have 2 Of that block. Just 2.
6.Tap the HOME Button (Not the back arrow)
7.Go back to mine craft PE and go to the same world.
8.TA DA! You duplicated your blocks.
9. Tell your friends.