Most likely it's a database/user problem.
Since you get a blank screen, the first thing to do is turn on the error/warning display of PHP. This can be done in the php config, but much easier then that is to add a .htaccess file to the root of the roster.
I prepared a .htaccess file for you here
Download and unzip it, then upload it to the main/root roster dir (the dir that contains the index.html, config.php, etc).
Now go browse to the roster and hit refresh. You should see a PHP warning/error now.
Things to check:
- The database exists and the tables have been created (you probably rember doing this, so easiest checked)
- A user has been created in phpMyAdmin and given rights to the database.
- The database and user/pw have been entered in the config.php of the roster, these are all case sensitive.
Keep me updated...