This is a module where you might want to add some more information or an image, a link to your social media presence, or whatever makes sense for your site.
You can edit this module in the module manager. Look for the Side Module.
This will be the home page.
Click on the login link at the top of the page and enter your username and password. Then you can edit the article to say what you want by clicking on the edit icon.
Once you are logged in you will also see a link to your site administrator and a page that tells you some more about working with Joomla! to make the site you want.