Using Minoxidil/Finasteride combo spray, where do I apply it

[mriordan23]

I was prescribed a spray minoxidil/finastride. I am also using laser cap therapy in combination with. My question is where do I apply the spray? I know I wouldn't use in the backs and sides where the hair typically is resistant to loss, but do I need it apply it to the entire top of my head or just in the front areas where it is currently receeding?