To display a score in WYSIWYP format with the Simplified Notation App, you will need a MusicXML file on your local screen device. This could be a personal computer, a tablet, or even smart phone (but the latter could be a bit small for easy reading). SJapp is designed to be compliant with Windows, Linux (including Android), and Apple. Throughout this course, there will be links to the Downloads page in order to get the music referenced. Most of them are short and are used to demonstrate concepts and playing technique. But there are also full tunes on the Downloads page that can be used later when there are the skills to play them. Or, it may be of interest at the outset to see what a full score looks like in WYSIWYP format.
So, as prompted by the lesson, click on the link to the Downloads page, and then click on the selected music file. It will be downloaded to your device's Downloads folder. You may choose to move it to another folder for managing your music files.
Next, start SNapp in your device's browser. Here is the link. It will open in a new browser window. Then click on the "Convert another MusicXML" file button and navigate to the folder containing the music file. Select the file and open it. The MusicXML will be converted to WYSIWYP format and displayed as virtual sheet music. You can now place your device on the piano music stand and off you go.
Alternatively, you can click on the "Save as PDF" button to download it to your Downloads folder where it also may be moved elsewhere. Open the PDF file with a reader such as Adobe Reader and from there it may be printed. Then take the printed score to your piano or just take your device.
That's enough to get you started. If you want to understand all of the functionality of SNapp go the WYSIWYP home page and click on the SNapp button on the top navigation bar on this page.