Once the Forum Application is created, you can create forum posts within that forum.
On the graphic below you see the instructions for creating a forum post.
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Once posted, the members of the community can reply to the thread, or like, or rate the content. As a Community Manager, the properties of the post can be modified, a new post can be added, or the post can be deleted.
Next up, you will learn some of the other options within the forum that you can manage as a Community Manager.