How do I replace the spark plug on my Audi A4?

I've noticed my engine has been running rough and I think it's time to replace my spark plugs. Can someone give me a step-by-step guide on how to do this on an Audi A4?

First, make sure you have the correct spark plugs for your specific Audi A4 model. Then, locate the spark plug wires and remove them from the spark plugs. Use a spark plug socket and ratchet to remove the old spark plugs. Be careful not to drop any debris into the spark plug hole. Inspect the new spark plugs before installing to ensure they are in good condition. Finally, use a torque wrench to tighten the new spark plugs to the recommended torque spec for your A4 model.