When the dialog is closed by clicking the "OK" button, the node is configured and the status light changes to yellow: the node is ready to be executed. Right-click the node again shows an enabled "Execute" option; clicking it will execute the node and the result of this node will be available at the out-port. After a successful execution the stauts light of the node is green. The result(s) can be inspected by exploring the out-port view(s): the last entries in the context menu open them