Break the island and press Feedback.
The first players' words already changed it: the controls are explained on screen now, and a ring marks where to hold. Next, the island has a feedback button at its foot. If the wave does something odd, a hold does nothing, or the page goes blank, press it and say what happened in a line. A picture of the screen and the island's state go with your words, so we see what you saw.
Every report gets an answer within a day, here or by mail, saying what it changed.