How to teach dog to use talk button

I am luring BB to push talk button with treats. This particular button says treat and then I reward him. My goal is to get him to associate pushing button to get treat. Then I will introduce "walk" button. #dogbehaviorist #fearfuldog #puppy #offleashdogtraining #pitbull #dogleash #dogtrainer #nailcare #husky #chihuahua