Open a crafting table
Place 3 iron blocks in the top row
Place 1 iron ingot in the center slot of the middle row
Place 3 iron ingots in the bottom row
Take the anvil from the result slot
Place the anvil where you want it in the world
Open a crafting table
Place 3 iron blocks in the top row
Place 1 iron ingot in the center slot of the middle row
Place 3 iron ingots in the bottom row
Take the anvil from the result slot
Place the anvil where you want it in the world