Obtain 4 Obsidian blocks
Obtain 2 Diamonds
Obtain 1 Book
Craft the Enchantment Table in a crafting grid using the following layout:
Bottom row: Obsidian | Obsidian | Obsidian
Middle row: Obsidian | Diamond | Obsidian
Top row: Obsidian | Book | Obsidian
Place the resulting Enchantment Table item in your world to use it