A flint and tinder
right click on it with flint and steel or power it with redstone
tap the tnt with flint and steel
I'm not sure how to get steel in Minecraft PE but to get flint, you need to use a shovel on gravel. Please note that it won't work every single time you use it on gravel.
Flint is sometimes dropped when you mine gravel.
Use a fire charge to light the portal
In minecraft to get flint you sometimes get it when you kill a creeper and it should make a big hole and you sometimes get flint
An iron ingot and a flint.
When you destroy gravel, there will be a 10% chance of it dropping flint.
you craft it with stee ingots to make a flint and steel which makes fire.
Craft one flint with an iron ingot( think about the name
You mine gravel, sometimes flint is dropped when you break a block of gravel.
flint and steel use it to detonate tnt ^.^