When you go to ur Wallet, click on Steemit Dollar amount, and u will see a list, one of them is Market... That's where you should Go and transfer ur SBD to Steemit... It's always the best trade... I had no idea u didn't knew this.. Even there, there is a trick, you don't have to take whatever price they give you... Delete the last 4-5 numbers and put 00000.....you will not get a trade right away... but the numbers fluctuates, and by the time u wake up, ur deal will happen...Its like in any Exchanges, u name ur price...