You used to be able to swap SBD to Steem in the wallet about a year ago. But it was a really bad option because you received horribe rates for it. I used to do that until I found that out like most people. So like most I went to the "Market" (click on your SBD of your wallet to see that option), and sold my SBD for Steem immediately. The old option got removed since people got smarter.