Board Game Arena

I had created a tournament for a group of friends
https://boardgamearena.com/tournament?id=76006

We had planned to do the tournament for swiss with 3 games however i had made a mistake and set it for 5 games.
Can someone help me to close the tournament after 3 games? it has already started.

If the tournament already has people registered, it is not possible to change the regulations.