Opening Mint Sealed tubes - help!

Ok, I bought 20 1/10 oz Vienna Philharmonics from a board member here but am unable to open the dang tube. It is a plastic tube and has a blue top with a circle in the middle. The seller told me to press the blue ring but that doesn't do too much. Any help would be appreciated.
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Press around the edge of the ring and the cap should pop open.
<< <i>What kind of tube is that? Does it protect the collector from coins that have been exposed to radiation? >>
Wifeproof cap.
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