Hey
Another quick tutorial, this one however is addressing how to transfer steem you ALREADY own to the steemit website. I'm making this because it's not particularly clear how you do this.
first things first, go to your exchange and select withdraw on the steem currency:
Now you see this address box? put in your Steemit.com USERNAME. In my case, 'Mrkuujo'
After that simply fill in the rest of the details and hit withdraw. Hopefully this was useful I know that a lot of people were getting confused because there's only details on how to withdraw bitcoin but you CAN withdraw steem currency directly! enjoy :)