A creaking noise from your Cambium saddle likely means that the nose rails are rubbing somewhere on the rubber top. This can be alleviated with a small dab of grease. Additionally, a noise can be made where the rails meet the backplate by the little black rubber plug. In this case the saddle could be reassembled and a small amount of grease applied at the contact points.
Learn how to properly repair your Cambium saddle watching our video tutorials: