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You can withdraw it to, for example, Bittrex (if you have an account there). Or you can exchange it to Steem tokens on the inner market here on Steemit (go to your wallet, select your SBD tokens, and click market). You can later do whatever you want to with the Steem tokens (but the best thing is to power up!)

Coin Marketplace

STEEM 0.22
TRX 0.27
JST 0.041
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SBD 3.33