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well first you withdraw it to your STEEM or SBD then if it's SBD you convert it as shown or use the "Market" button. To power up click on your STEEM and hit power up

Coin Marketplace

STEEM 0.23
TRX 0.24
JST 0.038
BTC 107262.02
ETH 3398.05
SBD 4.69