Webservices are a method to connect other environments to your own. By executing requests, you can retrieve data to process, store and show in your application.
To do the actual requests, we need to create a so-called Webservice endpoint. These endpoints point towards specific pages from the Webservice where in this case a set of data is served.
The right column of the Webservice we are viewing shows how many Webservice endpoints we have right now: 0. Click the + button to create an endpoint right away! Another form appears, this time to define the endpoint.