I found the solution for the problem!
I had to change back to the default WP-theme. Then I could see the network admin dashboard and add sites as I like. After creating the new site, I could go back and change the theme to whatever I like.
Yes, I want redaksjonen to be a totally separate blog.
Redaksjonen will be a resource site for all the contributors on the page. So Lunkomhei.com is the page everyone can see, and lunkomhei.com/redaksjonen is just for the writers, with tips, guidelines, etc.
Thanks
