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You will need to use a site that allows you to sell your BTC for USD. Here is one I recommend: https://www.coinbase.com

Can you please guide or please redirect to any article which explains how to transfer Steem Dollors into BTC using Coinbase only. Every article I find here talks about Bittrex and am a bit lost here.

Just go to BlockTrades.us. You can enter your coinbase BTC addresses and it will generate an address/memo to send your SBD.

Btw, using ETH instead of BTC has lower fees.

Thank you so much. I ll do that. btw.. what is ETH? gulp.. sorry for asking a lot of questions @timcliff .