I have seen on the tab "Access Levels" in administration for the Articles that one can set that the logged in users can post articles.
 
But how do they do that? Where can I find the function where the logged in users can post articles?

Hello,
 
Unfortunately, users can't post articles at the moment but this column was added with a thought for future so maybe we will add this feature at some point.
 
With kind regards,
ViArt Support Team

Does this feature exist in v4?

If this is possible, which I don't believe it is at this point, I would be able to chip in and be VERY intersted in this option based on both article type and/or user type. Also, if we could charge to post the article (option) that would be best.

Maybe charge users, either by money or by subtracting loyalty points from their balance? So the more they actually purchase, the more they could post using points.