It's not as simple as that but it's not difficult either. What you want is to have 3 ppm of chlorine 20 minutes after you put it into the tub. Depending on the size of the tub and bather load it could be a little or it could be a lot. Not sure if 1 teaspoon would be enough, I have a 400 gallon tub and I put in 2 tablespoons for that 3 ppm amount.
Are you using a nature 2 or a frog mineral cartridge? That could make a difference but I never held much stock in them.
I don't know what a 1 touch sanitize button does, but you want to keep the cover open for a few minutes after you add the chemicals to let the water off gas.