to change this page download Filezilla (an ftp client). You use this to upload and download files to your web space.
When you have downloaded and instaled Filezilla, you need to put in your ftp login details which are in your heart control panel.
You also need to unlock the domain in order to be able to add or delete files.
As you are no longer using wordpress you do not need a database, just upload an html file called index.htm and that will be your home page.
Lemme know if you get stuck.