Passing follows the player order, so you pass to the next player after you in the player order, and you receive from the player before you in player order.

If you are wondering about the player order, he player panels on the top right and the card played zones are displayed in player order (like for other games on BGA).

The direction is also indicated in the log. We thought it was clear but it has been reported (a few times, not many) so we may add something in the interface to make it easier.

You should also note that if the player variant "both ways" has been selected, the pass order is reversed on the second round. By default, all rounds have the same order (as per the rules).