How to change battery in keyless entry?

My keyless entry is not working for my 2006 mazda 6. I am assuming it is the battery. Before it stopped working I would have to hold the button for several seconds to lock and unlock my car. Now it is not working at allHow to change battery in keyless entry?there should be a small screw on the remote if not just pry it open. it will snap back together.How to change battery in keyless entry?You should take it to a Mazda dealership to have the battery changed.