Open a crafting table
Place 1 paper in the crafting grid
Add 1 to 3 gunpowder
Take the firework rocket from the result slot
Use more gunpowder for a longer flight duration
Add a firework star if you want an explosion effect
Craft a firework star with 1 gunpowder and 1 or more dyes
Add optional ingredients to the firework star for special effects
Combine the firework star with paper and gunpowder to make the rocket