Instructions
Walk up to the spinning pulsarium rings until you notice one of them becoming highlighted with a white aura. This means it is being highlighted by the in-game targeting system. The aura will appear and disappear as the ring spins. Get a sense of the timing.
Press the Force Grip button as soon as you notice that Starkiller is targeting the pulsarium ring. The ring will slow down before coming to a complete stop if you time it correctly.
Use the left and right thumbsticks to move the ring until it snaps in place. Push the sticks in the direction you want the ring to go. To cut down on the time it takes to do so, move the ring toward the smallest gap of space between it and the other rings.
Repeat the process for the remaining two rings until all three are aligned.