How do I turn Steem into Bitcoin?

I'm just wondering guys, what is the process and exchange I need to use to transfer steem into bitcoin?
I'm having a lot of fun turning US Dollars into bitcoin every payday, but, I would likely post and use steemit/dtube more often than Facebook, if I were clear on the process..

Oh! Perhaps I should search before I ask. I found this good and detailed post https://steemit.com/steemit/@pcste/total-crypto-newbie-guide-how-to-turn-your-steem-into-btc-and-fiat-cash
And this one: https://steemit.com/steem/@dailybitcoinnews/changelly-is-a-good-exchange-steem-to-bitcoin-exchange-system-shapeshift-drops-steem