All conscious humans have the capacity for freewill, but the scope of actual utilization is variable. We determine the degree of freewill ourselves, we are self-determined. We may do this by implicit, subconscious default or by explicit, conscious decision. Freewill is the extra freedom to create and evaluate options by understanding their implications. The scope of freewill depends on the actual utilization of this unique cognitive ability.
All mental processes are the functioning of a living brain.
These processes include the choices to focus or not, how long and hard to think about an issue, between Coke and orange juice, to make love or to make war. The brain is made up entirely of molecules and atoms that obey mechanistic causation. Let me present two perspectives that help resolve this apparent paradox. Emergent properties - There are many examples of new properties emerging from the combination of individual elements that do not posses them individually. Specific combinations, arrangements or interactions of components can give rise to totally new attributes.