Once you have named and opened your app, you will get a screen where Qlik Sense asks you to load your data:
When you have this option before you, you can load data in several different ways. The Add data command to the left will start with a wizard that helps you define what you want to load. In the background, it adds code to a script that defines the load sequence. It will, however, never show the script.
This is different from Data load editor that will take you to a script editor, where you can change the script directly.
The easiest way is to use Add data dialog to the left. This will open the Add data dialog where you can define a data source; either a database table or a file, for instance, an Excel spreadsheet.
Use Connections for folders and connections that you have previously used, and use Connect my data if it is a new data source. In this dialog, you can select your database table or browse your way to a file containing...