You need to build out your hierarchy. If you want other articles/collections to show up, add them either to the top-level collection or to other collections within it. They nest, like folders and files on your computer.
The update button will appear on the browse page for any collection in your system. You'll only hit snags if your top level collection consists completely of articles. We suggest having at least one collection in the top level to provide a place for updates to happen.