Can anyone tell me, how the normal (registered) user can add an article (item) to one of selected categories?

Im trying to find it, but cant see it :(

Thanks for reply.
Lukas

Create a K2 user group - Registared
Set the permissions for this user group
Add the user/s you want to this k2 user group
publish the K2user or K2login module
The link with be presented after login "Add new item"