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Go to your poloniex account, under "deposit and withdrawal", look for STEEM, you will get this:

螢幕快照 2017-06-14 上午5.33.01.png

Then, make a transfer from your wallet to "poloniex".
Don't forget the "memo", but don't use mine or the money will come to me. LOL

Welcome to Steemit :)
U need send to an account (look on poloniex steem wallet)
I follow u, follow me back if u want lot of fun and amazing picture every day.

Out of my league. Still researching crypto in general. I'm following your blog... Good Luck.