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I've never used happy frog, I have used ocean forest cut with ~25% perlite, but that was ages ago. The happy frog it seems is to be used in conjunction with their nutrient line.
You have to make a decision. You can either grow organically with dry amendments, or synthetically with bottled nutrients. If you grow organically you'll want to mix up your own soil, if you grow synthetically you'll just want to grow hydroponically.
For now I would wait and see what they do, being careful not to over water. If they start looking deficient you should feed with light nutes. My favorite for veg is a kelp-alfalfa tea. 1 cup alfalfa meal, 1/4 cup kelp meal to 5 gallons of water. Stir occasionally for 24-36 hours then apply.