To open the app editor, in the app details page click on the top-right side button Open the App, the app page will open:
Working space: where you can drop nodes in it and create links between nodes.
Top part: app name, save app, execute app, and stop execution if the application is running.
Bottom part: nodes list, where you can search nodes created by you or by the community, drag and drop them in the working area.
Output window: consists of three tabs:
Description: the short description of the app or the description of the selected node.
Log: the execution log for the whole app.
Output: show the output of the selected nodes after the execution finished.