I put the seeds to germinate, the root has already come out and I put them in the substrate. But I don't know what to do after here.how often do I put water on it?
I agree with @allseednoclone It's been 3 days; how are the plants looking?
What medium are you using? It looks awfully dark. I dont see much for aeration.
Water them about once every week or when you notice the soil is dry, you can stick your finger about a inch into the soil to check for moisture. If its dry then water.