Thanks for pointing it out. We're currently looking at revamping the Greenfoot website, which should take care of that and several other issues.
I've fixed the link on greenfoot.org - thanks. But as Neil says, this will all change soon anyway.
@ADelia1996, please start a new discussion thread for your issue. Also, include what the timer is used for and whether you want the timer displayed on the screen or not. It is also best to include code you have tried already and a brief description on how it does not work as you want.