Removing Bullets

I have seen this topic many times, but I cant get rid of the bullets before/above my posts. I tried some of the CSS codes provided in other topics but it isnt working. Im quitte a beginner withg CSS and dont know exactly where to use which code and in which file.

This is the website showing the bullet (quitte unfinished, but I just got stuck here). Can someone help me?!

http://jebandzelf.nl/?p=81

Thanks!

http://ww.wp.xz.cn/extend/plugins/widgets-on-pages/