DeGraphQL Kong Enterprise Plugin

Problem statement -
Defined different routes in a Kong service using Serverless Lambda plugin. For example -
Route1 => POST /users
Route2 => PUT /users/{userId}
Route3 => POST /users/{userId}/blogs/{blog1}

If I want to call a single end point to post a blog of an user, then I could use DeGraphQL plugin, so request for the trial license. Need to know "How we can configure this plugin on service level just to avoid 3 end points for the user resource.

Referring this link for the plugin configuration, but stuck on this step.

One more thing, in case of trial Enterprise license, what is the end point URL will be, if I want to play with the admin APIs.

Please use for a faster response.