Website news items are shown on your "Latest News" page in date descending order (newest items first) as well as on your sidebar (for items set as "featured").
To create a news item, click the "Add News Item" button.
You can also choose to have your homepage display your latest news items by going to "Setup > Club > Club details" and clicking on the "Website Settings" tab.
This will replace your whole homepage with your latest news items list.
If you upload a featured image, that image will be displayed in your sidebar (if set to be a featured news item) above the intro text.