Amazon S3 URL rewrite

I have Amazon S3 installed and my media files are stored under the S3 bucket. My media file URL look like https://bucketname.s3.amazonaws.com/wp-content/uploads/2013/05/comments_error4.gif
How do I use this plugin to elimintate ‘bucketname.s3.amazonaws.com’ and replace it with my domain name?

Thanks for your time.

https://www.ads-software.com/extend/plugins/wordpress-cdn-rewrite/