You should look at tweaking your configs and securing your TikiWiki site as well as upgrading to 188.8.131.52 before it ends up like the phpBB.
The way the theme is designed will be very hard to keep upto date with security and future releases of TikiWiki as you have replaced/altered the main set of templates in templates/ rather than overriding them in templates/styles//
Anyway, the article rating is set my the editor when they create the article with the type set to: Review. 7 just happens to be the default. It is designed to work almost as a product review, rather than a voting system.