Step 1) There is a link at the bottom left of the home page that you need to edit. But the link is not on the home page - it is in an Extension Module.
You need to be logged is as Admin using the the administrator login.
You change the grid By clicking [Region List] at this Link
Set the Domain name to the URL in Help-Show Grid Address.
Now edit the HG URL to be the same address.
Step 2) Change the Banner
This is the Default banner:
You can upload new media and change the banner at this link and clicking Image Module
Step 3) Edit Home Page
You edit the Home page and remove the Introductory text: Change Text
Step 4) Unpublish this page by clicking the check box to the left of the word "Final Steps" Unpublish This Page