on the relic device puzzle how do i get the symbols right on the device thats in the c

Have you looked at the walkthrough here?

If you still find yourself needing more help, I would watch a YouTube playthrough of this puzzle.

I'm not sure which part of the puzzle you're stuck on, if it's the one at the end, try this walkthrough (It's mine) https://www.youtube.com/watch?v=r8zM60MjuuI&list=PLrWwuQDIdduoKGKgWmOjd2og9eatK7WOi&index=15 (on part 15, go to around 6:15)