Categories, will not show

How can i get the pages i have created to show in my categories menu?

I have all the pages on top of screen but want them also to be shown under the title categories.

How to do this? I'm not an experienced used to please explain it step by step...

My webpage is here http://student.hil.no/list/

have a look if i dont understand what i mean.

Sorry for not the best english.

Thanks for any help.