How to remove trim bumper for access to leaking seam?

[chevyguy]

FINALLY found where my leak appears to be coming from. Way in the back right corner of my 93 spx seadoo. Can't see the exact spot from the inside (need to remove the buoyancy foam, but I assume it is from the hull seam (possible winter freeze separation?)

How do I remove the trim bumper for access?
How do I remove the rivets?
How do I put it back together?

Thanks so much.

Cheers, Jimmy