To get started you must go to the Plone Control Panel. Click the Site Setup link (usually found near the top of your site along with the other site action links) or add plone_control_panel to the end of your web address. You should now see a screen like this one:

Now click on the Search icon in this listing. You can now choose which content types you would like to include in search results, as well as toggle the LiveSearch feature on or off. The familiar content types that you are used to working with will be in this listing mixed in with some content types that may be unfamiliar to you. There are legacy types (such as the CMF content types) from earlier versions of Plone and some are there because of add-on products you have installed.

Be sure to click Save when you are finished.