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1)    Use an 8MM L-Shaped Allen Wrench to take off bolts from the old seat pad (Figure A) 
2)    Take out the boltsand disc plastic interior. (Figure B). 
3)    Remove the old round pad. (Figure C). 
4)    Replace  the  new  round  pad,  then  assemble  the  disc  plastic  interior  and  fix  the  bolt  with   
L-Shaped Allen Wrench(Figure D) 
 
 
 
Figure A                                                                                          Figure B     
 
 
 
 
Figure C                                                                                          Figure D