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Wrong move. Keep Steem for now

while i do agree with @melip,

for the sake of your question you can perhaps read this post by @cryptos here

https://steemit.com/guide/@cryptos/understanding-steem-power-and-how-to-power-down-your-steem

once you've powered down. you can sell your STEEM to an exchange. There are a few but personally i recommed Bittrex. There's a "noob-friendly" post you can read here

https://steemit.com/steemit/@nioctib/how-to-withdraw-steem-from-bittrex-to-steemit-wallet-noob-friendly

but I do hope you keep them though, as a starting Steemian your most wonderful friend is your Steem Power

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