Defining KM as a Search Provider for the Portal 
To be able to search for Knowledge Management (KM) content in the portal, you need to define KM as a search provider in the Search Configuration UI.
In the portal, choose .
Choose Add Provider.
In the Add search provider dialog box, select Knowledge Management
Optional: To set KM as the default search provider, in the Search Providers table, select the Knowledge Management search provider and choose Set Default Search Provider.
Note
For this change to take effect, portal users must clear their browser cache, or log off the portal and then log back in.