Trouble sending STEEM to Steemit account

[ccedk_pro]

Did you write to [email protected] ?

[spider-crab]

On Bitshares I initiate a withdraw using OPEN.STEEM. I then use my steem username for account and it says 'please enter a valid steem address' in red. I also put the memo key (found on the permissions tab in steemit) in the memo box on Bitshares. All to no avail. What am I doing wrong?