The salt is for nitrite not ich, so use the calculation here to work out how much salt to add. It should be a lot less than 1 tablespoon per 5 gallons.
Part II SO YOU STILL WANT TO KEEP CYCLING WITH FISH? If you are determined to ignore the above advice in Part I and still think you want to proceed with a fish in cycle, then you need to be aware of the information presented below. SOME IMPORTANT FACTS ABOUT AMMONIA Ammonia in water exists...
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Take some tank water into a jug, add the salt to that and make sure it is fully dissolve before pouring it slowly back into the tank.