The main window (1) is the area where you can drag and drop Nodes in to program your application. The Nodes (2) can be found in the Node-Pallettes (3).
Our first flow will be a Request of https://proficloud.io. Place an injection-, http-request- and debug-Node into the main view. And connect them. By double clicking on the http-request Node the configuration window for this Node will open. Here you can enter the URL. A click on the button Deploy will make the flow running. After activating the injection Node the http-request Node will request the webpage and the debug Node prints the result in the debug window.