As shown in figure, the squarecaps of two bolts has to insert intothe holes of the troughs of bridge. The center part of the bolts can be adjust according to the position of commode hole, then covers on the side of bridge
Put the seat cover onto the commode, and insert the bolts in to the commode holes, as shown in the above figure.
Adjust the seat cover to make it coincide with the commode, put on the washer and screw the nuts tightly, as sown in above figure.