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There are two ways of publishing notifications in UWP apps.
First, if you want to push notifications from your own server then you will need to use the Windows Push Notification Services (WNS). I'm not sure what document that you are referring to but you could check this - Windows Push Notification Services (WNS) overview. It contains the full process of using WNS to push notifications.
Second, you could try to push notifications from the Partner Center directly. Please take a look at this document: Send notifications to your app's customers. This is the tutorial about how to configure your app and send notifications to your app from the Partner Center.
Thank you.
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