I want to explain how witdrawal steem to bitcoin , follow tutorial and steps following :

1. You can create an account https://blocktrades.us/ 
2. Creating an account there and select convert Steem to Bitcoin or Steem Dollar for bitcoin.
3. fill out how many would you send for example 30 steem.
4. you will get information where would you send or steem steem your dollar , fill in your username and memos have been given.
5. fill in what numbers and username, as well as the memo.

 Steem should arrive in your steemit wallet after approximatly 3 min