One of two things needs to happen. Either:
1) you make sure the name of your home page is index.html or index.php (depending on whether your page is a static HTML page or a PHP script page, of course); or
2) you create an indexes entry in your home directory's .htaccess file to point to the page you want to use.
Note that the filename for your index page is case-sensitive; it must be all lower-case. If you don't have an index page, then the server creates one (the "index of /" page you're seeing now).