How to make TNT on minecraft PC?

I have minecraft 1.7.10 and i can't figure out how to make TNT,
how to set it of would be helpful to

Guest

This will answer your question - http://minecraft.gamepedia.com/...ia.com/TNT

Computers

You need 4 sand blocks and 5 pieces of gunpowder.
On a crafting table, put the gunpowder in the top left, top right, middle, bottom left and bottom right to make an X shape. Put the sand in the remaing four slots.
Thats the recipe for TNT blocks.

Note that some servers (certainly some non-PVP ones) disable TNT to prevent griefing.

Squidmaster