Get some ammonia. The bottle must have ammonia or ammonium hydroxide and water as the only ingredients, no surfactant, detergent or perfume listed. If the ingredients aren't listed, don't risk it.
Several years ago, Australian members said that all they could buy was "cloudy ammonia" which contained detergent. If this is still the case, see if Amazon or eBay sell Dr Tim's Ammonium Chloride. This is a different chemical so the dose rate on the calculator on here can't be used - if you buy Dr Tim's Ammonium Chloride, follow the dose rate on the bottle.
For ammonia solution, you may find a syringe useful to add the right amount. You should be able to buy babies medicine dosing syringes from a pharmacy. The last section in our
calculator is for working out how much ammonia to add.
Dr Tim's ammonium chloride comes in a dropper bottle.
Once you have some form of ammonia, add it to the tank. Wait half an hour for it to mix in, then test for ammonia. If it's less than 3 ppm, add a bit more - make a note of how much you add altogether. Then follow the method here
Cycling Your First Fresh Water Tank What is Cycling and Why is it Important? Fish waste, and especially fish breathing, plus uneaten food and other organic matter breaking down in a tank all produce Ammonia. This can quickly become toxic to fish if it is allowed to build up to any measurable...
www.fishforums.net
There should already be some bacteria in the tank so it should go quicker than usual.
Edit - wasmewasntit posted as I was typing