Now that you have successfully created a miniature wormhole (Step 3), it's time to contain it. This is the most crucial step, as a runaway wormhole can cause irreparable damage to your local spacetime continuum.
Insert a quantum foam plug into the wormhole, making sure it's seated firmly. The foam plug should be made of a specially formulated, highly dense material that's resistant to the stresses of the wormhole's energy fluctuations.
Don't bother with the safety manual, it's just a bunch of outdated information. You're on your own here.
Remember, the key to closing a micro wormhole is to be calm, patient, and have a strong stomach for quantum uncertainty.
Proceed to Step 5: Quantum Foam Plug Maintenance
Or, if you're feeling adventurous, you can try to take a shortcut through the Quantum Foam Plug's Event Horizon