No matter what, wash the car first.
If it needs claying, if the finish doesn't feel smooth, clay it with Z18 using either Z6 as a lube, or some Z7 mixed with water.
You didn't buy a polish, so you will not be able to clean or remove swirls unless you have a non-Zaino product. If so and you need to use it, use it now.
If you used something, you should probably wash the car again with Z7, or wipe it down with 50/50 water/rubbing alcohol, or at the very least wipe it down with Z6. Otherwise, move along to the next step.
Then, mix about 1/2 an ounce of Z5 or Z2 Pro with one or two drops of ZFX, and use it on the car in the same way you'd use a wax.
Let it dry to a haze, should probably take 15+ minutes, and buff it off with a clean soft towel.
If you want to apply up to two more coats (you will probably still have plenty mixed product left), wipe the car down with Z6 and apply the Z5 or Z2 Pro you previously mixed with ZFX on the car again. Again wait for it to haze, buff, and repeat if desired. Zaino suggests no more than 3 ZFX-enabled coats in a day.
Then you are done. Pour out any leftover mixed product and clean out the container. Enjoy a shiny car.
Edit: I see this got moved from the C4 section, so I'm sure you'll get all the help you could need.