Configuring Advanced Search in Out of Box authoring portlet of WCM 8

1.        Open  Integration solutions console (having url like https://yourhost:port/ibm/console/logon.jsp)  and login as administrator

2.   Click Resources > Resource Environment > Resource Environment Providers.

3.   Click WCM WCMConfigService > Custom properties 

4.   Search for following entries.

•  wcm.authoringui.advancedsearch.searchonselection
• wcm.authoringui.simplesearch.addstar
• wcm.authoringui.advancedsearch.addstar

If these are not available please create new by clicking on "New"

Now your portal is activated for using "Advanced search feature in OOB WCM authoring portlet"