1.) Hold the lid over the bearing so that the "inside" surface of the lid faces upward. (This is so that you can attach the bucket to the lid.)
2.) Align the four holes in the lid with the four machine screws, and pull the screws up through the holes in the bucket. (This part takes a bit of fiddling -- it helps to have a second pair of hands!)
3.) Use the appropriate-sized nuts to attach the lid to the turntable bearing. Use pliers to tighten the nuts as far as possible.