For your sample app to work, you should have a Kontent project containing content. Your app should be then configured with its project ID. You can either get it by signing in using your Kontent credentials or by signing up for a trial. Later, it will be converted to a free plan.
You may wish to either select from existing projects or create a new sample project. The app will be configured with its project ID.
Alternatively, you can configure your app manually by submitting a project ID below.
Alternatively, you may wish to use the shared project (project ID "975bf280-fd91-488c-994c-2f04416e5ee3").
Note: You cannot edit content in the shared project.