For the newbies how to they convert there steems to SBD simple just log into the account and click on wallet .
click on the steems avaiable in your account click on the market.
a new page will be open which show market buy and sell set any trade you want from there sell or buy.
and then you can wait for the selected price you chose or the exchange and you will get the required sbd. For more updates related to steem and information stay tune and follow and for any question ask in comments thanks.