If you view the source of the URL you posted you can see what appears to be raw PHP code. This generally indicates that your webserver is not setup correctly to pass requests for *.php files to the PHP interpreter via your webserver. I can also see the opening PHP tag is "<?" and not "<?php", if memory serves, in order to use the shortened version, you need to set that in php.ini. Otherwise, just change your scripts to use "<?php".
I also see via builwith.com that you're using Apache, so ensure your http.conf or httpd-vhosts.conf file is configured correctly to serve PHP, or consult your hosting provider (Codero?) and log a helpdesk ticket with them. If you do have shell access yourself, then the pertinent parts of httpd.conf are as follows:
1). Look for the section LoadModule and add the following, then restart apache:
LoadModule php5_module libexec/apache2/libphp5.so
2). Look for the <DirectoryIndex> block and add "index.php" (Unless you're using SilverStripe with mod_rewrite, in which case ignore this)
3).Depending on the setup, you may also need to add an AddType block as well, sorry I forget the syntax but googling around will help you.