How to ConnectYour Services in SharePoint 2010
To use services in your SharePoint 2010 sites, you have to connect your Web Application to the desired services by setting up service application associations. To use Central Administration to do so, follow these steps:
Navigate to the Central Administration home page.
Click Application Management.
The Application Management page appears.
In the Service Applications section, click Configure Service Application Associations.
The Service Application Associations page controls associations of Web Applications or service applications to proxy groups. The view you select determines the contents of the page; for example, Web Applications view lists your Web Applications, shows the application proxy group to which you can map them, and lists application proxies for that proxy group.
In the Service Application Associations page, select either the Web Application to which you want to add an association or the application proxy group mapped to that Web Application.
The Configure Service Application Associations page appears, allowing you to edit the associations for the application proxy group.
From the Configure Service Application Associations page, select the service applications that you want to connect to the Web Application.
You can add and remove service application associations as needed.
Click OK to save changes to the group of connections.
If you're editing the default application proxy group, any changes you make affect all Web Applications that make use of that proxy group.