You can think of the configuration recorder as the on and off switch for the AWS Config service. You must first enable the configuration recorder before the service can start creating your CIs. When you first configure AWS Config, the configuration recorder is automatically started, but once started, you can stop and re-enable it at a later date:
This shows the initial configuration screen and allows you to select the resource types that you want AWS Config to record. If you uncheck Record all resources supported in this region, then you will be able to select from a drop-down list of Specific types, an example of which can be seen here:
With your chosen resources selected and the destination S3 bucket selected to store your configuration history and snapshot files, the configuration recorder can begin making resource changes.