It’s something everyone has done so don’t worry!
The plastic circular part with holes in it sits on the spindle with the metal square locking it in place. The spigot with the spring sits in the hole on the pump side and marries to any hole in the plastic part.
On the pump side the circular part sits on the corresponding pole, the three metal dowels sit in the three holes on the outer circumference of the metal spinner
When you marry the two halves together don’t forget the rubber seal