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Removing the drain may help. You will need to also find out how the water is getting behind the liner and try to fix that, to prevent further problems. Most drains are threaded into the drain fitting below it, but first remove the stopper, which is often threaded in; remove it by turning counter-clockwise with pliers. There are often cross members to reinforce the drain and these can be used to turn the drain out, with a pair of pliers. Sometimes a hammer and a blunt object is needed to get it started. The drain needs to to be turned counter-clockwise to remove. Here is a picture of a typical drain.
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Best of Luck, Brian
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