In Nancy Drew: Sea of Darkness, Soren asks Nancy to put together the ropes (knots) display. To solve this puzzle in the museum, simply make educated guesses to what the steps are for tying the ropes. Place the first step on the left side, and place them in order going to the right, with the right-most slot being the final step.
It can help to work backwards for each rope tie. Place the finished rope card on the right side.
Select and scroll through the cards on the right of your screen, pick one up and click to place it in one of the slots. You’ll know it’s correct when Nancy speaks.