Thanks for posting this question for updates to your homepage. I'm a bit confused, however. Are you referring to your Jive landing page? Or a specific home/landing page for a place? If possible, please provide a screenshot of that page you're trying to update.
Reviewing through your description, if you are an admin user, you should see the following option available on your instance's homepage:
which will allow you to update the layout and widgets present for your homepage.
Additionally, you might find the following sections of the documentation helpful: