To run the graph, right-click anywhere inside the Graph Editor pane and select → from the context menu. The graph will run.
In the Console tab below the Graph Editor pane, you can see the graph run report. If everything is OK, the graph execution should be successful. You should see the following window (with numbers of parsed records near below the edges):
(If you want to see more detailed information about graph run, double-click the Console tab. After that, you can restore the original size of this tab when you double-click it again.)