Instruction is not included

While I reading its function before buying it, it seems pretty easy to use and the SOME positive review made me buy it. After using it my knife was not sharp at all. I really don't know what I was doing wrong because there is no instruction included. I just follow the description here but it didn't work. I know that it is cheap and I should manage my expectations when buying cheap items, but buying something that barely works is something else. There goes my $18.99

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