I'm not sure if using pure ammonia is covered in the article about cycling in our cycling section or not...but it is something you should check out.
To make it simple, you want to dose your tank with ammonia so you get a reading of 2 ppm from your ammonia test. You want to make sure there is still ammonia in there, so you have to keep testing and dosing the tank to keep the ammonia levels up, but not much higher than 2ppm. Once the 2ppm of ammonia is consumed in a 24 hour period, your tank is cycled.