After creating a vNext release and trying to initiate it from the command line I quickly realized that it is no longer supported.
In order to figure how to accomplish initiating a release from outside of a TFS build I stumbled upon this post. However I'm unable to see any REST Api's in my install of release management.
Components Installed:
Below is where I am expecting to see these API's under something like:
Am I looking in the right spot for this API or do I need to install something else?
Those API's don't physically exist and are provided by a runtime engine. If you use the documented calls you will get access to the API.
Note: Most Rest API's don't physically exist in the way that you describe. You can use Fiddler to interrogate the running API for discoverability.