Usually they're in a slot where you can just loosen the screw and slide them to a new position on newer games. It should be a machine screw. On older games there will be a wood screw and you'll actually have to screw it into the wood in it's new position, though there's usually a dimple in the wood for each position.
Can't comment specifically on that game because I've never owned it but I would guess you just need to loosen the mounting screw and slide the post.