Thanks for reply Krikor, as said they are already allowed to edit published articles, but every time they click on save after editing published and not published articles, they get the message: you are not allowed...

imgur.com/a/1N7RM
If they can't publish items, then the item will not be able to be published hence the 403 error. You need to enable the Publish Items flag or the edit any item flag.

Maybe I did not explain it well. I need to let users to edit their own articles, not to publish. With Joomla articles it is possibile: user insert new article and save it. Then he can open and edit again it before that an admin publish it. Is this possibile with K2 article or not? Thanks

Just to say that this question has not a really reply. Thanks

Sorry for having not replied in so long.
I will need to investigate this post a bit further so please bear with me.

Sorry for having not replied in so long.
I will need to investigate this post a bit further so please bear with me.