If you want to transfer your steam from your steam wallet to bittrex
in your steemit wallet click on steem,(were it shows your balance)click on transfer
A Transfer to Account form will show up,
send to "bittrex" without quotes.
and make sure you enter the memo "06c9fc420bab4fea8e8" (without quotes) bittrex told you to enter, thats it.

test with small amount first till you are sure.