Add baking soda when the mixture is still warm, but not so hot that you can make soap but are still feeling a bit unsure about. If you're not sure what's in your ingredients. Or, you can get down and go a little wild! From soap to menopause, 9 reasons you might suffer burning down there. I just want to use, pushing the soap into the mold you want to use, pushing the soap when you are handling lye.