I am assuming you have fish in the tank? If so, then you are going to need to do approximately 3 back to back 50% water changes waiting 1 - 2 hours in between them to get the ammonia down to safe levels (It's a lot of work which sucks). An ammonia of .25ppm is generally recognized as safe for fish.
I would also check out this link as it has helped tons of people in a similar situation.
I just learned about cycling but I already have fish. What now?! - Aquarium Advice
What fish do you have in your tank now?
How often are you feeding them?
What are you using as a dechlorinator?