Just ignite the thing using any Fire Starter, Lighter or Flint & Tinder once you have everything you need to start the Recipe.
The “Igniter” is a Machine that can automatically ignite any Machine if needed and is powered by electricity. The Electricity for that can be gotten via a Solar Panel or something if you need it to be convenient, and it can also be turned on/off using Circuitry and Redstone.
(This answer should be better as it contains more Info so i am gonna change the Solution to this)