The News Feed is the noticeboard for the tribe. Tribe owners can use it for announcements or to signpost external events and resources. When a news article is published, everyone in the Tribe gets a notification.
Tribe owners have the option to Create post in the News Feed. Tapping on this takes you to a screen where you can upload an image, enter a title for your post, add content, and optionally add a button that links to the web for more information.
When your article is ready, select Review to see how it will look for your Tribe. When you're happy, press Publish post.
Pro tip: Racefully automatically crops and fits your image to a 650x280 rectangle. You can use the editing features of your phone's Photos app to prepare your photo for the article so it fits well in the space.