Craft fireworks with paper and gunpowder
Add firework stars for colored explosions
Put the fireworks in your hotbar
Hold the firework rocket in your hand
Right-click or use the item to launch it
To shoot from a crossbow, load the firework rocket into the crossbow
Fire the crossbow to shoot the firework
To boost with elytra, use the firework rocket while gliding
To launch fireworks from a dispenser, place the rockets inside the dispenser and activate it