You did this earlier in the game, remember?
Well, it's exactly the same this time, except Ewan is nowhere to be seen and the clips have to go in different places this time.
So go to the Cathedral hub and pull out the computer drawer, then put on the glasses and place the clips. You know the drill, right?
But if you get stuck, here's how to place the clips this time:
What do I do with what I learn?