PHP WAMP install php_tidy

i have installed on my computer WAMP with PHP 5.2.9-2. I want to install php_tidy and开发者_StackOverflow中文版 i have read some tuts over the internet and i found out that i have to uncomment this extension=php_tidy.dll in php.ini, the problem is that i can't find that line.

assuming you are on Wampserver 2.0 you just need to click on the Wampserver icon in your system tray, then go PHP > PHP extensions and click on php_tidy