If you have not been provided with a module that bundles an update center's URL, you need to register the update center manually. Once you have registered the update center, you can access its modules via the Update Center wizard, which you can access under the Tools menu.
To manually register an update center's URL:
The Options window appears.
The General Update Center dialog box appears.
You have now manually registered the update center's URL. To verify that you have done so successfully, choose Tools > Update Center. Your newly registered update center should be included in the list in the Update Center wizard. Select it and click Next to access the modules that are provided by the selected update center.