As I realise my site is in Dutch I will translate so you can reply.

When you push the ‘reageer/reply’ button (on the right side) there will be an screen which says
Reageer / Reply.
The first line is Naam: please write your Name there;
The second line is E-mail: that is the easy part (you don’t have to give your address);
The third line is Website: if you have a website and you want others to visit your site, write your website address in here;
The fourth line (the big one) is Tekst (Text): This is the place where you can reply. You can not write very long because every ten minutes there will be a new screen. Maybe it is better if your write your comment in Word and than with copy and paste put it in the reply screen.
When you’ve written your text you have to click on the button below that says “Plaatsen” (Submit). Only then the text will appear in the web-log.

Maybe it won’t work for you. You can mail me and I will put your comment in the site.

I hope it works for you right now.