I am trying to find a jungle, but I cannot find one. How do I find one?
Jungles can be determinantly generated in random worlds. You just need to look hard to find one. I cannot find any suggested seeds for Minecraft: Pocket Edition, but all it takes is not just luck, but you need to try hard to find a Jungle. If you can't find a Jungle in one world, make another world and find one! If not, rinse and repeat. Make sure you made the worlds at "random seed".