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What are you trying to do? If you are withdrawing from Poloniex to your Steem account, just use your username. All lowercase, no '@'. Like this: feedthemachine

The fields available are: Address: , Memo: , Amount: @demotruk Are you saying for address = username? Have you tried this ; )

Yes I have, yes address = username. No need for Memo. Amount is self explanatory.