How do I light a chimney?

[Simplicity]

Simple question, but I can't find any info: How do I light a chimney?

I can only create unlit chimney, and there is no details on how to light it. The torch doesn't work.

 

[Maxwell Ellington]

The bloomery requires the bloomery base and bloomery chimney to function, with the chimney attached to the top of the base. You use a torch on the base to light it, but it must first have the coal and iron/glass inside. It is easiest to see this with tooltips turned on. Once lit, the chimney will smoke and the base will spark 

[Streetwind]

@Maxwell Ellington I'm pretty sure he means the standalone chimney block, not the bloomery chimney.

@Simplicity You can craft the unlit version in survival but it has no particular function. If you wanted the lit variant, you could go into creative mode (/gamemode c) and swap it for the lit counterpart.