Use a text editor(Mac) or MsWord(windows) or a similar program to create an HTML file with content(feed) please.
Save it in an empty(!!!) folder on your desktop (Important: as all content on the same level as the main HTML file plus subfolders get embedded, you don't want your desktop content in your app ;-)
Double click the HTML to see whether it's working in a browser. If it is working fine, you are ready to get it into your app.
InDesign and QuarkXPress slightly vary how to include this. For InDesign you create a hyperlink (type file) whereas for QuarkXPress you use a Web View object (picture box) where you include this HTML file.