Hello

This is the component/article area of your template. To remove this area of your template completely try adding the following to the Custom CSS field of your templates parameters.

#container_main {

    display: none;

}

Presuming you wish to use this area on other pages of your site, you will need to create a separate template style specifically for your homepage to which you will add the above CSS. For details on creating multiple template styles please check out the following tutorial... http://www.joomla51.com/tutorials/item/creating-multiple-template-styles

Ciarán