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Open the enchanting table. Place a book in the enchanting table. Place the lapis lazuli in the table. Select an enchantment. Move the enchanted book to your inventory. Repeat as necessary.
Select the enchanting table to do so. Select an ordinary book, then select the book-shaped box in the crafting table. Select your lapis lazuli, then select the box to the right of the book's box. You'll need at least three lapis lazuli per enchantment. On the right side of the crafting table's interface, you'll see several enchantments listed. Select the one you want; if you don't see the one you want, select the lowest-level one. The book should now be purple and pink, signifying that it has been enchanted. You most likely won't find the enchantment that you want the first time around, so keep enchanting books until you find the enchantment that you want.  It's best to create low-level enchantments when the enchantment table gives you three unwanted enchantment options. After creating an enchanted book, you'll need to re-level your character to level 30.