Go onto an exchange with your Ripple, convert into Steem :).
But in all seriousness, I can confirm that Coinbase is pretty easy. On an exchange, convert XRP into Bitcoin or Ethereum, send that to Coinbase, then sell it on Coinbase for $. Deposited right into my account!
Check My Post And Upvote my post.
https://steemit.com/ripple/@akibsteemit/61-japanese-bank-use-ripple