If you're adding bottled ammonia I think it's one dosage at the beginning, as opposed to the fish food method which is every day. I've never done it this way though so am not 100% sure.
You don't really need to do any water changes unless there are living things in the water, you can just let it do it's thing. That is, unless ammonia and nitrite get really high (say above 4ppm), I think I heard somewhere that it can affect the cycle.
It's still saying you have no ammonia, which isn't right since you added some. If it's the API master test kit the low colours on the ammonia test can be hard to distinguish, make sure you're checking the chart in really good lighting.