Instructions on how to use Ick Away medication?

I have White Spots on my fish, after reading they have the symptoms of it, surface breathing, lack of eating, and running into walls. I bought the Wardley Ick Away. Can you give me more specific instructions on how to use the product. I treated the water and took out filter yesterday, today i changed out 50 percent of the water and took out the ornaments. The temperature was turned up. I would like more specific instructions of how to use the product. How many times should i treat the water and how often should i change the water? PLEASE help, i have only had the fish a week. there are 3. 2 mollys and a pleco.