We'll install an alternative module to show teasers on the home page, BT Content Slider:
Navigate to http://extensions.joomla.org/extensions/news-display/articles-display/articles-showcase/19125 and click on Download to download the ZIP file containing the extension. You're taken to the developer site. After clicking the Download button there, click on Register to register for a free account and log in to the site. You're taken to the download page where you can download the ZIP file. Make sure to select the most recent version for Joomla 3.x.
In the backend of your site, navigate to Extensions | Extension Manager. You'll be taken to the Install screen of the Extension Manager.
Now install the extension by clicking on Browse to select the extension ZIP file on your computer. Click on Upload & Install. Once the installation is complete, you'll see a message (Installing module was successful).