Not found: /apis

I’m newbie in Kong, so I’m still learning from its documentation.
Currently I see many examples of plugins, like JWT, which they comment for configuring through /apis. (example:
However when I try to call this endpoint I receive

    "message": "Not found"

Do I have to activate it by somehow?
PS. I installed Kong under Ubuntu with PGSQL.

Kong 1.0+ does not anymore have APIs, it now has routes and services. Either start using the new entities or downgrade your installation to 0.15.0.