Put it in the hometopintro topic following the instructions I posted in your other thread
Make sure you are entering the script in HTML mode (the <> button) and not Design mode (the pencil button). Also make sure that the html editor configuration is set to allow scripts in topics, as
outlined here in this knowledgebase article.
or place it in the page.default.xml.config xmlpackage directly (this is the xmlpackage that is used for the home page by default, or create a separate skin to use for the homepage and add it directly there
<a href="http://www.aspdotnetstorefront.com">Shopping Cart Software</a>