I don't understand what to do.

In this scenario, it is necessary to strictly follow the sequence of actions. I played it a long time ago and don't remember it very well anymore... But first, you need to go to the hut, then to the monks, and then, I think, back to the hut, and so on. I also remember that the monks send you to that leftmost hero - he is supposed to disappear, supposedly to attack the knight-guards... I don't know if it's appropriate to leave this here, but here it is - http://heroesland.ucoz.ru/publ/30-1-0-405. The link provides a complete description - what, where, and how :) Good luck!