Are you referring to this? Redirect Map Manager
If so then that is part of the ACS Commons open source project and you would need to download and install ACS Commons to your AEM instances before you could use it. See here Adobe AEM Commons.
Here are some instructions that might help you in setting it up:
1. Install ACS Commons on both AEM Author and Publish instances.
2. Follow the steps in this documentation on the Author instance to create the configuration page. After creating the configuration on the Author instance, then "Activate" / "Publish" that configuration page to the publish instances.
3. Follow the steps in the same documentation under "Setting Up Redirect Map Manager in Apache" to configure your Apache web servers to keep an updated copy of the map.