After installation, you will start with a demo page which you can edit it to whatever you like. The beauty of the Million Dollar Script is that the main page is not a script, but just another simple HTML file. This means that you can load the page in any HTML editor and edit your website just like any normal page. (After installation, the demo file is called example.html. Please rename to index.html if you want it to be set as the homepage.)
There is more information about changing customization in the 'Tips and Tricks' category of this Knowledge Base.