Yes, agree with azza, your fish are in a rather urgent situation. It would be ideal to re-home them back to the store or to another established aquarium if possible, otherwise it may be difficult to keep them alive.
If you have to keep them, you need to consult our help posts for "Fish-In" cycing within the Beginners Resource Center here in the "New to the Hobby" section.
You need to begin by doing daily water changes of 50-70% with conditioner and rough temperature matching (your hand is good enough.) Conditioner is the chemical that removes chloramines or chlorine. Meanwhile you need to find a liquid-reagent based test kit. Many of us like and use the API Freshwater Master Test Kit, which has tests for ammonia, nitrite(NO2), pH and nitrate(NO3.) After you get the test kit and read the instructions, you need to quickly test and post up your tap water and tank water results here so the members can look over your situation and further advise.
~~waterdrop~~