...
In the API Manager, open a proxy for editing, then go to the Proxy Endpoints tab.
Click the endpoint's name in the list.
Learn more: Proxy Endpoint Details.
To edit the proxy details, click the Edit Details button.
Note: You can update only the URL and HTTP Method(s) of the endpoint.
To apply security policies to the endpoint, click the plus icon ( ) below the View Applied Policies button.
...