Have you had your Boy Scouts take their Den Chief Training? In-person is always best.
But online is better than none. This requires Flash, so it will not work on Apple mobile devices. If your computer does not have Adobe Flash already, you can download it for free from Adobe.com.
Den Leaders, Scoutmasters, and future Den Chiefs should all take the training just to make sure that everyone is on the same page.
Den Leaders should have a short bullet-point list of expectations to share with the Den Chief and Scoutmaster to provide accountability and ease of cooperation. Here is an example of where you can start.