Gather materials:
4x Iron Nuggets
1x Torch
1x Iron Ingot (Java/Bedrock depending on edition behavior)
Craft a lantern:
Place 4 iron nuggets in a square pattern
Place the torch in the center
Take the lantern from the output slot
Alternative (if available in your version):
Craft or place a lantern using the recipe that uses iron nuggets and a torch as the core ingredients
Place the lantern:
Select the lantern in your hotbar
Use it on a block to attach it to a surface