Explanation:
As AWS Config continually records the changes that occur to your AWS resources, it sends notifications and updated configuration states through the delivery channel. You can manage the delivery channel to control where AWS Config sends configuration updates. You can have only one delivery channel per AWS account, and the delivery channel is required to use AWS Config. To change the delivery channel name, you must delete it and create a new delivery channel with the desired name. Before you can delete the delivery channel, you must temporarily stop the configuration recorder. The AWS Config console does not provide the option to delete the delivery channel, so you must use the AWS CLI, the AWS Config API, or one of the AWS SDKs.
Reference: http://docs.aws.amazon.com/config/latest/developerguide/update-dc.html