When viewing the page source, there is a clue saying the password is in /etc/natas_webpass/natas8. Now, if you click on Home, you will direct to a page ending with index.php?page=home. If you click on About, it changes to index.php?page=about. What happen if we change that to the path /etc/natas_webpass/natas8. Bingo, password is displayed.