If you view Recently Active Threads Faqlet you should see a link in your Sitedocclan Nodelet that says "View Sitedoclet", which will bring you to the sitedoclet for the page. This applies to any superdoc that has a corresponding sitedoclet. I think there are three so far. Likewise when you are viewing a sitedoclet you should see a link for its superdoc appear in your SDC nodelet.
This is new stuff so dont feel bad for not noticing it earlier. OTOH, you should probably have a look at the SDC wiki for details on how sitedoclets work.