I had the same issue. There is a rubber O-ring that makes it waterproof and is very tight when new. You twist counter-clockwise as per instructions and then use your thumbs from underneath the cover to pop up one side of the cover (and possibly work the other side as well) until the seal is broken. Once you open it once it gets much easier.
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I had the same issue. There is a rubber O-ring that makes it waterproof and is very tight when new. You twist counter-clockwise as per instructions and then use your thumbs from underneath the cover to pop up one side of the cover (and possibly work the other side as well) until the seal is broken. Once you open it once it gets much easier.