In order for SharePoint site collections to forward search queries to a search center, the connection to the search center must be configured. In this recipe, we will configure our site collection to forward search queries to the search center we created in the Creating a search center site recipe.
Follow these steps to connect a site collection to a search center:
In your preferred web browser, navigate to the site collection to which we are connecting the search center.
Click on Site settings from the Settings menu.
Select Search Settings under Site Collection Administration as shown in the following screenshot:
Enter the URL to the Pages library in the search center. For instance, if the search center is at http://sharepoint/sites/search, enter http://sharepoint/sites/search/pages for the URL as shown in the following screenshot: