This conversation reminds me of those with very young inquisitive children who, not matter the response provided, ask again: "Why?".
Just substitute "How?" in this case.
Paul, I do not mean to demean here at all but just as we couldn't get an answer to the why question as children, I do not think there is an answer to this how question you are asking as an adult. It is either an incoherent question (there is no such thing as free will) or it is an intractable one (there is free will, but its "how" can not be explained in the procedural/mechanistic parlance of human language).
Just substitute "How?" in this case.
Paul, I do not mean to demean here at all but just as we couldn't get an answer to the why question as children, I do not think there is an answer to this how question you are asking as an adult. It is either an incoherent question (there is no such thing as free will) or it is an intractable one (there is free will, but its "how" can not be explained in the procedural/mechanistic parlance of human language).