Okay, here it is step by step:
1. Do the cheats, I think you got that down.
2. Put a test fog emitter somewhere on the lot.
3. While still in buy/build mode, ctrl shift click the ball. I dunno, might be shift click. Try both out.
4. A pie menu should come up. Click set visual effect.
5. Type in the code.
6. Go to live mode. If it is making an effect, yay! Build around it, make more, etc.