lets seek into that part in the video where i show you how to set-up the mysql database.
i was telling the details about : the localhost, and password ans username
you've already had this program in that folder (maybe)
this code still have a very big problem, it is using short open tags meanwile your server don't supposed this coding technique any more.
you have to change the <? intp <?php
<?= into <?php echo ..... ; ?>
just have a look at your source code, you see the PHP source code! its very dangerous!
just think of a case where you set up the database connection in short open tags, if i know the DB conn file name, i can see it in the browser. this is that reason why its a suggested trick to place the includes outside the HTTP root folder.
i can find your password in a minute if you know this settings-program combinations.
good luck.