How to use free will in life? Well, you are a tiny little fraction from the universe; a pitch of energy, successfully graduated to be a human. Your aim is to be evolved faster. And the entire Universe is made for your evolution. You are on a journey to be God. It's pretty difficult to be God as you have to have the experience from all forms of life and you need to have zero karma, practicing love. The final stage of your evolution is your liberation and free will plays a dominant role in determining the course of your life. 