How do I customize the Knowledge Base tab in our customer portal?

How do I customize the Knowledge Base tab in our customer portal?

It looks like we only have the option to customize the Home Page of the customer portal.  How can I gain access to control what shows on the the Knowledge Base?  It shows 'Recent' and 'Most Viewed' articles - but what if I want to arrange specific links or widgets on this page to access key parts of our knowledge base?