Your going to have to get on the deck and work on it lying down. Use your forearms as the fulcrum. Keep your hands and the liner as dry as possible, it's like a greased pig when it's wet.
Fold the bead to the wall side over on itself. Pull up on this part of the liner above the "slot". As you lessen the pull on the bead to let the liner now drop "down" towards the "slot", the bead will begin to unfold at a 90degree angle from the vertical liner wall section, thus sliding into the slot.
I'm sure that sounds weird, but as waste and I have said it's sort of hard to describe.
Lowering the water may be the next step.
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