Hello and welcome!
Yes, as others have said, the bottle will have instructions listed to tell you how much to add. I’m sure that each product has different “dosing” concentrations, so no one can really tell you what you need to do with the product that you have.
Are you new to ponds? When you added your koi to the holding tank, how did you dose that water?
Tell us more about your pond set up, and post pictures if you can — we love to see the ponds of other members!