You need to collect the red orb on the right first and put it on the gray socket on the left to open the Gate.
After that collect the two red orbs there and pick up the orb that is still on the sockel.
Then look around for the fourth orb it should be pretty easy to find.
When you got all four red orbs, place one down on the gray sockel in the Module and the other 3 on the 3 golden sockels ahead.