The section of the site settings is the Metadata information which is submitted to search engine better index your site.
Site Title: Will always be set to the site default. Your title will appear in the top of your browser window when changed.
Site Description: This is a short description of your site.
The title and site description will be shown in the search engine results when they return your site homepage.
Site Keywords: are submitted to search engines to help them index your site.
We recommend adding no more than 16 keywords or key phrases keeping them very specific to your site. These are separated by a comma and a space. It is important that your keywords are repeated in your site title and description.
Allow Search Engines to scan the site: By default your site will be hidden from the search engines. This is to give you time to get your site ready to launch.
Once you have pointed your domain name to your site and gone live, you should change this option to 'Yes' to allow search engines to index your site on your live domain. Click 'save settings' and your changes will be saved.