You can add all the cycle you want, but I'm afraid that it won't do any good...
First and best option (IMO) - Rehome the fish with a friend / back to where you bought them, do some reading of fishless cycling and start again
Second option - Get cracking on the water changes, around 30% a day until you see Ammonia / Nitrite hit 0
The positive sign is that the tank is clearly startying to cycle, but it can't be at all pleasent for the fish...