Actually, at this stage it is 3 ppm.
The next stage is a bit complicated to explain.
Test every second day. You need to wait until you have zero ammonia and then zero ammonia again two days later. You need two tests two days apart with zero ammonia. Only when you've had the second zero is more ammonia added, and this time it is not the full amount but one third of the amount added at the start.
The idea behind waiting for certain targets and then adding less ammonia is so that nitrite can't get high enough to stall the cycle.
If at any time after the first ammonia addition (Dose #1) you test and ammonia is under .75 ppm and nitrite is clearly over 2 ppm, it is time to add more ammonia (Dose #2). Add the same full amount as you did the first time.
The next stage is a bit complicated to explain.
Test every second day. You need to wait until you have zero ammonia and then zero ammonia again two days later. You need two tests two days apart with zero ammonia. Only when you've had the second zero is more ammonia added, and this time it is not the full amount but one third of the amount added at the start.
The idea behind waiting for certain targets and then adding less ammonia is so that nitrite can't get high enough to stall the cycle.