Hello,
thank you for your interest in our products.

In order to add an endpoint under a specific host in Point Editor in Live Binding, select the root ("Hosts") node, and then select "Add: OPC UA Host" form the toolbar or context menu (right-click). Enter the host name, press Enter. Then select "Add: OPC UA Endpoint" and enter the endpoint URL.

Alternatively (and possibly quicker), you can switch to the Properties tab, select "OPC-UA Attribute Point" in "Point type", and then expand the "Endpoint Descriptor" wor and enter the endpoint next to "URL string" (and the switch back to the Brwose tab).

There currently isn't a way to show the double-click "Add ..." nodes you mentioned, or influence the Well-known nodes, in Point Editor in Live Binding. Both these are on the list of possible future improvements.

Best regards