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Grasp the ring on either side of the opening with your needle-nose pliers or flat nosed pliers. You'll need two pairs of pliers, one on each side. Twist one side towards you and the other side away from you by gently twisting your wrist. To close the opening, just reverse the twisting motion.
A nifty tool also exists that looks like a ring. There is a little slot on the top of the ring that can be used to do the twisting motion.