Your tank isn't cycled; that means growing enough good bacteria in your filter to eat the ammonia from the fish pee.
'Stats' means how much of the harmful substances ammonia and nitrite are in your water.
What you need to do is buy yourself a test kit; one of the ones with a test tube, not the paper strip ones, they're not accurate enough. If you can afford a master test kit that can test for ammonia, nitrite and nitrate that would be best, but the ammonia one is most important right now, as that will be what is making your fish sick. Test the water every day, and if there's any ammonia in there, do a big water change so that it's as near to zero as you can get it.
Change 50% every day until you can get the test.
You'll also need some white spot or 'ich' medicine from your fish shop. Use that as per the instructions, but remember that those instructions will be for cycled tanks.
You'll need to add the right amount of whitespot medicine into the new water so that you have the right concentraion in the tank (it's quite easy; if the bottle says '2 drops per gallon', then you put two drops per gallon in the new water), but you really need to do the water changes to get rid of the ammonia; that will kill the fish quicker than the ich.
Best of luck; do ask again if you need more help