I'm having hard time figuring out how to access the bolts from above on this toilet seat. As you can see in the picture, there are no bolt covers behind the seat so that you can pop them out, just like on many other toilet seats. In another picture you can see that I removed a plastic piece that sticked between the hinge and the bowl. I thought this might have helped me remove some other plastic parts so I could access the bolt, but I couldn't figure it out from there (the last picture). Is there anyone who could help me with this issue? Thanks!