These tools are meant to be kept in the refrigerator and used on clean skin. Start at the neck and work your way up the face using slow strokes that work from the midpoint out towards the ears.
Be sure to clean them with antibacterial soap after each use and store them dry, in their container, and handle them with care! If they are dropped they may start to leak, at which point they need to be disposed of and are no longer safe to use.