You need sand and gunpowder, crafted like this:
S G S
G S G
S G S
S = Sand
G = Gunpowder
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I assume you mean TNT. All you have to do is hit it.
you need to be in multi-player or a server to make the TNT work.
redstone torch
The ID (code) for TNT in Minecraft is 46.
5 Gunpowder and 4 Sand