I have my blog posts link to Catergories.  When I click on the Catergory menu in my side bar, it can take me to all the blog posts I have assigned to that catergory.  So it takes me to a seperate page.  This has the Main Sidebar set and I have made it empty, but where do I find the link to change what Sidebar is shown there?  Please click on 'Weddings' in Catergories, so you can see an example.  At the moment, the sidebar is empty.