Thanks for all your help but I am still not sure what to do. I have an inground vinyl liner pool and the coping looks like half of a white metal pipe that is laid vertical from the cement deck down the side of the pool (like 2 inches). The liner goes up the wall and the top of the liner has an inch or so liner trim that tucks into a very small gap between the top of the liner (pool wall) and the coping. I don't see a track just a gap a little bigger than a butter knife that the liner is tucked into. It looks like it just needs to be pushed back up into that gap but I don't know how to do it and keep it there.

Thanks again,

Mary